31457231999 has 2 divisors, whose sum is σ = 31457232000. Its totient is φ = 31457231998.

The previous prime is 31457231969. The next prime is 31457232011. The reversal of 31457231999 is 99913275413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31457231999 - 2¹⁶ = 31457166463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31457231999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31457231969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15728615999 + 15728616000.

It is an arithmetic number, because the mean of its divisors is an integer number (15728616000).

Almost surely, 2^31457231999 is an apocalyptic number.

31457231999 is a deficient number, since it is larger than the sum of its proper divisors (1).

31457231999 is an equidigital number, since it uses as much as digits as its factorization.

31457231999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 53.

The spelling of 31457231999 in words is "thirty-one billion, four hundred fifty-seven million, two hundred thirty-one thousand, nine hundred ninety-nine".