31331222987 has 2 divisors, whose sum is σ = 31331222988. Its totient is φ = 31331222986.

The previous prime is 31331222981. The next prime is 31331223013. The reversal of 31331222987 is 78922213313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31331222987 - 2⁸ = 31331222731 is a prime.

It is a super-2 number, since 2×31331222987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31331222981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665611493 + 15665611494.

It is an arithmetic number, because the mean of its divisors is an integer number (15665611494).

Almost surely, 2^31331222987 is an apocalyptic number.

31331222987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331222987 is an equidigital number, since it uses as much as digits as its factorization.

31331222987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The spelling of 31331222987 in words is "thirty-one billion, three hundred thirty-one million, two hundred twenty-two thousand, nine hundred eighty-seven".