31341403921 has 2 divisors, whose sum is σ = 31341403922. Its totient is φ = 31341403920.

The previous prime is 31341403903. The next prime is 31341403969. The reversal of 31341403921 is 12930414313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18046160896 + 13295243025 = 134336^2 + 115305^2 .

It is a cyclic number.

It is not a de Polignac number, because 31341403921 - 2⁵ = 31341403889 is a prime.

It is not a weakly prime, because it can be changed into another prime (31341400921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15670701960 + 15670701961.

It is an arithmetic number, because the mean of its divisors is an integer number (15670701961).

Almost surely, 2^31341403921 is an apocalyptic number.

It is an amenable number.

31341403921 is a deficient number, since it is larger than the sum of its proper divisors (1).

31341403921 is an equidigital number, since it uses as much as digits as its factorization.

31341403921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 31341403921 in words is "thirty-one billion, three hundred forty-one million, four hundred three thousand, nine hundred twenty-one".