31308859061 has 2 divisors, whose sum is σ = 31308859062. Its totient is φ = 31308859060.

The previous prime is 31308858989. The next prime is 31308859063. The reversal of 31308859061 is 16095880313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23094880900 + 8213978161 = 151970^2 + 90631^2 .

It is a cyclic number.

It is not a de Polignac number, because 31308859061 - 2²² = 31304664757 is a prime.

It is a Sophie Germain prime.

Together with 31308859063, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31308859063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15654429530 + 15654429531.

It is an arithmetic number, because the mean of its divisors is an integer number (15654429531).

Almost surely, 2^31308859061 is an apocalyptic number.

It is an amenable number.

31308859061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31308859061 is an equidigital number, since it uses as much as digits as its factorization.

31308859061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 31308859061 in words is "thirty-one billion, three hundred eight million, eight hundred fifty-nine thousand, sixty-one".