769071981 has 4 divisors (see below), whose sum is σ = 1025429312. Its totient is φ = 512714652.

The previous prime is 769071977. The next prime is 769071983. The reversal of 769071981 is 189170967.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 769071981 - 2² = 769071977 is a prime.

It is a super-2 number, since 2×769071981² = 1182943423918528722, which contains 22 as substring.

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 769071981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769071983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128178661 + ... + 128178666.

It is an arithmetic number, because the mean of its divisors is an integer number (256357328).

Almost surely, 2^769071981 is an apocalyptic number.

It is an amenable number.

769071981 is a deficient number, since it is larger than the sum of its proper divisors (256357331).

769071981 is a wasteful number, since it uses less digits than its factorization.

769071981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256357330.

The product of its (nonzero) digits is 190512, while the sum is 48.

The square root of 769071981 is about 27732.1470679787. The cubic root of 769071981 is about 916.1972764812.

The spelling of 769071981 in words is "seven hundred sixty-nine million, seventy-one thousand, nine hundred eighty-one".