31555453993 has 24 divisors (see below), whose sum is σ = 37196397888. Its totient is φ = 26689080096.

The previous prime is 31555453913. The next prime is 31555454017. The reversal of 31555453993 is 39935455513.

It is not a de Polignac number, because 31555453993 - 2⁹ = 31555453481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31555453993.

It is not an unprimeable number, because it can be changed into a prime (31555453913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1417255 + ... + 1439347.

It is an arithmetic number, because the mean of its divisors is an integer number (1549849912).

Almost surely, 2^31555453993 is an apocalyptic number.

It is an amenable number.

31555453993 is a deficient number, since it is larger than the sum of its proper divisors (5640943895).

31555453993 is a wasteful number, since it uses less digits than its factorization.

31555453993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22493 (or 22486 counting only the distinct ones).

The product of its digits is 5467500, while the sum is 52.

The spelling of 31555453993 in words is "thirty-one billion, five hundred fifty-five million, four hundred fifty-three thousand, nine hundred ninety-three".