31542993949 has 2 divisors, whose sum is σ = 31542993950. Its totient is φ = 31542993948.

The previous prime is 31542993941. The next prime is 31542993959. The reversal of 31542993949 is 94939924513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16578365049 + 14964628900 = 128757^2 + 122330^2 .

It is a cyclic number.

It is not a de Polignac number, because 31542993949 - 2³ = 31542993941 is a prime.

It is a super-2 number, since 2×31542993949² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31542993893 and 31542993902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31542993941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771496974 + 15771496975.

It is an arithmetic number, because the mean of its divisors is an integer number (15771496975).

Almost surely, 2^31542993949 is an apocalyptic number.

It is an amenable number.

31542993949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542993949 is an equidigital number, since it uses as much as digits as its factorization.

31542993949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9447840, while the sum is 58.

The spelling of 31542993949 in words is "thirty-one billion, five hundred forty-two million, nine hundred ninety-three thousand, nine hundred forty-nine".