978756041041 has 3 divisors (see below), whose sum is σ = 978757030363. Its totient is φ = 978755051720.

The previous prime is 978756041009. The next prime is 978756041047. The reversal of 978756041041 is 140140657879.

It is a happy number.

The square root of 978756041041 is 989321.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 755632071441 + 223123969600 = 869271^2 + 472360^2 .

It is not a de Polignac number, because 978756041041 - 2⁵ = 978756041009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 978756041041.

It is not an unprimeable number, because it can be changed into a prime (978756041047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 494661 + ... + 1483981.

Almost surely, 2^978756041041 is an apocalyptic number.

978756041041 is the 989321-st square number.

978756041041 is the 494661-st centered octagonal number.

It is an amenable number.

978756041041 is a deficient number, since it is larger than the sum of its proper divisors (989322).

978756041041 is an frugal number, since it uses more digits than its factorization.

978756041041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978642 (or 989321 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 978756041041 in words is "nine hundred seventy-eight billion, seven hundred fifty-six million, forty-one thousand, forty-one".