31214872531 has 2 divisors, whose sum is σ = 31214872532. Its totient is φ = 31214872530.

The previous prime is 31214872459. The next prime is 31214872597. The reversal of 31214872531 is 13527841213.

It is a strong prime.

It is an emirp because it is prime and its reverse (13527841213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31214872531 - 2¹³ = 31214864339 is a prime.

It is a super-2 number, since 2×31214872531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31214872231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15607436265 + 15607436266.

It is an arithmetic number, because the mean of its divisors is an integer number (15607436266).

Almost surely, 2^31214872531 is an apocalyptic number.

31214872531 is a deficient number, since it is larger than the sum of its proper divisors (1).

31214872531 is an equidigital number, since it uses as much as digits as its factorization.

31214872531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The spelling of 31214872531 in words is "thirty-one billion, two hundred fourteen million, eight hundred seventy-two thousand, five hundred thirty-one".