31861000537 has 2 divisors, whose sum is σ = 31861000538. Its totient is φ = 31861000536.

The previous prime is 31861000433. The next prime is 31861000571. The reversal of 31861000537 is 73500016813.

It is an a-pointer prime, because the next prime (31861000571) can be obtained adding 31861000537 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31143778576 + 717221961 = 176476^2 + 26781^2 .

It is an emirp because it is prime and its reverse (73500016813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31861000537 - 2¹¹ = 31860998489 is a prime.

It is not a weakly prime, because it can be changed into another prime (31861000837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15930500268 + 15930500269.

It is an arithmetic number, because the mean of its divisors is an integer number (15930500269).

Almost surely, 2^31861000537 is an apocalyptic number.

It is an amenable number.

31861000537 is a deficient number, since it is larger than the sum of its proper divisors (1).

31861000537 is an equidigital number, since it uses as much as digits as its factorization.

31861000537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 31861000537 in words is "thirty-one billion, eight hundred sixty-one million, five hundred thirty-seven", and thus it is an aban number.