31340205961 has 2 divisors, whose sum is σ = 31340205962. Its totient is φ = 31340205960.

The previous prime is 31340205943. The next prime is 31340206087. The reversal of 31340205961 is 16950204313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17683946361 + 13656259600 = 132981^2 + 116860^2 .

It is a cyclic number.

It is not a de Polignac number, because 31340205961 - 2⁷ = 31340205833 is a prime.

It is not a weakly prime, because it can be changed into another prime (31340205901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15670102980 + 15670102981.

It is an arithmetic number, because the mean of its divisors is an integer number (15670102981).

Almost surely, 2^31340205961 is an apocalyptic number.

It is an amenable number.

31340205961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31340205961 is an equidigital number, since it uses as much as digits as its factorization.

31340205961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 31340205961 in words is "thirty-one billion, three hundred forty million, two hundred five thousand, nine hundred sixty-one".