31861000433 has 2 divisors, whose sum is σ = 31861000434. Its totient is φ = 31861000432.

The previous prime is 31861000397. The next prime is 31861000537. The reversal of 31861000433 is 33400016813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30760950544 + 1100049889 = 175388^2 + 33167^2 .

It is a cyclic number.

It is not a de Polignac number, because 31861000433 - 2¹⁰ = 31860999409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31861000396 and 31861000405.

It is not a weakly prime, because it can be changed into another prime (31861008433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15930500216 + 15930500217.

It is an arithmetic number, because the mean of its divisors is an integer number (15930500217).

Almost surely, 2^31861000433 is an apocalyptic number.

It is an amenable number.

31861000433 is a deficient number, since it is larger than the sum of its proper divisors (1).

31861000433 is an equidigital number, since it uses as much as digits as its factorization.

31861000433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 31861000433 in words is "thirty-one billion, eight hundred sixty-one million, four hundred thirty-three", and thus it is an aban number.