31118504377 has 2 divisors, whose sum is σ = 31118504378. Its totient is φ = 31118504376.

The previous prime is 31118504359. The next prime is 31118504423. The reversal of 31118504377 is 77340581113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31025651881 + 92852496 = 176141^2 + 9636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31118504377 is a prime.

It is a super-2 number, since 2×31118504377² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31118504357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15559252188 + 15559252189.

It is an arithmetic number, because the mean of its divisors is an integer number (15559252189).

Almost surely, 2^31118504377 is an apocalyptic number.

It is an amenable number.

31118504377 is a deficient number, since it is larger than the sum of its proper divisors (1).

31118504377 is an equidigital number, since it uses as much as digits as its factorization.

31118504377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 31118504377 in words is "thirty-one billion, one hundred eighteen million, five hundred four thousand, three hundred seventy-seven".