31818000961 has 2 divisors, whose sum is σ = 31818000962. Its totient is φ = 31818000960.

The previous prime is 31818000959. The next prime is 31818000967. The reversal of 31818000961 is 16900081813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26011560961 + 5806440000 = 161281^2 + 76200^2 .

It is a cyclic number.

It is not a de Polignac number, because 31818000961 - 2¹ = 31818000959 is a prime.

Together with 31818000959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31818000961.

It is not a weakly prime, because it can be changed into another prime (31818000967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15909000480 + 15909000481.

It is an arithmetic number, because the mean of its divisors is an integer number (15909000481).

Almost surely, 2^31818000961 is an apocalyptic number.

It is an amenable number.

31818000961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31818000961 is an equidigital number, since it uses as much as digits as its factorization.

31818000961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 31818000961 in words is "thirty-one billion, eight hundred eighteen million, nine hundred sixty-one", and thus it is an aban number.