3157237921 has 2 divisors, whose sum is σ = 3157237922. Its totient is φ = 3157237920.

The previous prime is 3157237901. The next prime is 3157237933. The reversal of 3157237921 is 1297327513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2855833600 + 301404321 = 53440^2 + 17361^2 .

It is a cyclic number.

It is not a de Polignac number, because 3157237921 - 2⁷ = 3157237793 is a prime.

It is not a weakly prime, because it can be changed into another prime (3157237901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1578618960 + 1578618961.

It is an arithmetic number, because the mean of its divisors is an integer number (1578618961).

Almost surely, 2^3157237921 is an apocalyptic number.

It is an amenable number.

3157237921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3157237921 is an equidigital number, since it uses as much as digits as its factorization.

3157237921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 40.

The square root of 3157237921 is about 56189.3043292049. The cubic root of 3157237921 is about 1467.0191064579.

The spelling of 3157237921 in words is "three billion, one hundred fifty-seven million, two hundred thirty-seven thousand, nine hundred twenty-one".