31213322331187 has 2 divisors, whose sum is σ = 31213322331188. Its totient is φ = 31213322331186.

The previous prime is 31213322331167. The next prime is 31213322331241. The reversal of 31213322331187 is 78113322331213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31213322331187 - 2²³ = 31213313942579 is a prime.

It is a super-2 number, since 2×31213322331187² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31213322331157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606661165593 + 15606661165594.

It is an arithmetic number, because the mean of its divisors is an integer number (15606661165594).

Almost surely, 2^{31213322331187} is an apocalyptic number.

31213322331187 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213322331187 is an equidigital number, since it uses as much as digits as its factorization.

31213322331187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The spelling of 31213322331187 in words is "thirty-one trillion, two hundred thirteen billion, three hundred twenty-two million, three hundred thirty-one thousand, one hundred eighty-seven".