31897684547 has 2 divisors, whose sum is σ = 31897684548. Its totient is φ = 31897684546.

The previous prime is 31897684541. The next prime is 31897684589. The reversal of 31897684547 is 74548679813.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31897684547 - 2³⁴ = 14717815363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31897684547.

It is not a weakly prime, because it can be changed into another prime (31897684541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15948842273 + 15948842274.

It is an arithmetic number, because the mean of its divisors is an integer number (15948842274).

Almost surely, 2^31897684547 is an apocalyptic number.

31897684547 is a deficient number, since it is larger than the sum of its proper divisors (1).

31897684547 is an equidigital number, since it uses as much as digits as its factorization.

31897684547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 62.

The spelling of 31897684547 in words is "thirty-one billion, eight hundred ninety-seven million, six hundred eighty-four thousand, five hundred forty-seven".