31493866531 has 2 divisors, whose sum is σ = 31493866532. Its totient is φ = 31493866530.

The previous prime is 31493866501. The next prime is 31493866597. The reversal of 31493866531 is 13566839413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31493866531 - 2¹⁷ = 31493735459 is a prime.

It is a super-2 number, since 2×31493866531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31493866501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15746933265 + 15746933266.

It is an arithmetic number, because the mean of its divisors is an integer number (15746933266).

Almost surely, 2^31493866531 is an apocalyptic number.

31493866531 is a deficient number, since it is larger than the sum of its proper divisors (1).

31493866531 is an equidigital number, since it uses as much as digits as its factorization.

31493866531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 49.

The spelling of 31493866531 in words is "thirty-one billion, four hundred ninety-three million, eight hundred sixty-six thousand, five hundred thirty-one".