31495837481 has 2 divisors, whose sum is σ = 31495837482. Its totient is φ = 31495837480.

The previous prime is 31495837463. The next prime is 31495837493. The reversal of 31495837481 is 18473859413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28372033600 + 3123803881 = 168440^2 + 55891^2 .

It is a cyclic number.

It is not a de Polignac number, because 31495837481 - 2²² = 31491643177 is a prime.

It is a super-2 number, since 2×31495837481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31495837441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15747918740 + 15747918741.

It is an arithmetic number, because the mean of its divisors is an integer number (15747918741).

Almost surely, 2^31495837481 is an apocalyptic number.

It is an amenable number.

31495837481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31495837481 is an equidigital number, since it uses as much as digits as its factorization.

31495837481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The spelling of 31495837481 in words is "thirty-one billion, four hundred ninety-five million, eight hundred thirty-seven thousand, four hundred eighty-one".