1231978441 has 8 divisors (see below), whose sum is σ = 1254471680. Its totient is φ = 1209637152.

The previous prime is 1231978403. The next prime is 1231978453. The reversal of 1231978441 is 1448791321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231978441 - 2⁷ = 1231978313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231978394 and 1231978403.

It is not an unprimeable number, because it can be changed into a prime (1231973441) 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 7 ways as a sum of consecutive naturals, for example, 21561 + ... + 54118.

It is an arithmetic number, because the mean of its divisors is an integer number (156808960).

Almost surely, 2^1231978441 is an apocalyptic number.

It is an amenable number.

1231978441 is a deficient number, since it is larger than the sum of its proper divisors (22493239).

1231978441 is an equidigital number, since it uses as much as digits as its factorization.

1231978441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75975.

The product of its digits is 48384, while the sum is 40.

The square root of 1231978441 is about 35099.5504387164. The cubic root of 1231978441 is about 1072.0154289868.

The spelling of 1231978441 in words is "one billion, two hundred thirty-one million, nine hundred seventy-eight thousand, four hundred forty-one".