31381854399 has 48 divisors (see below), whose sum is σ = 53234388480. Its totient is φ = 17438224320.

The previous prime is 31381854367. The next prime is 31381854407. The reversal of 31381854399 is 99345818313.

31381854399 is a `hidden beast` number, since 3 + 1 + 3 + 8 + 1 + 8 + 543 + 99 = 666.

It is not a de Polignac number, because 31381854399 - 2⁵ = 31381854367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31381854349) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7436112 + ... + 7440330.

It is an arithmetic number, because the mean of its divisors is an integer number (1109049760).

Almost surely, 2^31381854399 is an apocalyptic number.

31381854399 is a deficient number, since it is larger than the sum of its proper divisors (21852534081).

31381854399 is a wasteful number, since it uses less digits than its factorization.

31381854399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7460 (or 7457 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 31381854399 in words is "thirty-one billion, three hundred eighty-one million, eight hundred fifty-four thousand, three hundred ninety-nine".