921957247831 has 2 divisors, whose sum is σ = 921957247832. Its totient is φ = 921957247830.

The previous prime is 921957247819. The next prime is 921957247837. The reversal of 921957247831 is 138742759129.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 921957247831 - 2⁷ = 921957247703 is a prime.

It is a super-2 number, since 2×921957247831² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921957247837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460978623915 + 460978623916.

It is an arithmetic number, because the mean of its divisors is an integer number (460978623916).

Almost surely, 2^921957247831 is an apocalyptic number.

921957247831 is a deficient number, since it is larger than the sum of its proper divisors (1).

921957247831 is an equidigital number, since it uses as much as digits as its factorization.

921957247831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 58.

The spelling of 921957247831 in words is "nine hundred twenty-one billion, nine hundred fifty-seven million, two hundred forty-seven thousand, eight hundred thirty-one".