31320173313 has 64 divisors (see below), whose sum is σ = 54622713600. Its totient is φ = 17486254080.

The previous prime is 31320173303. The next prime is 31320173321. The reversal of 31320173313 is 31337102313.

31320173313 is a `hidden beast` number, since 3 + 1 + 320 + 1 + 7 + 331 + 3 = 666.

It is not a de Polignac number, because 31320173313 - 2¹⁸ = 31319911169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31320173303) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1957281 + ... + 1973217.

It is an arithmetic number, because the mean of its divisors is an integer number (853479900).

Almost surely, 2^31320173313 is an apocalyptic number.

31320173313 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31320173313 is a deficient number, since it is larger than the sum of its proper divisors (23302540287).

31320173313 is a wasteful number, since it uses less digits than its factorization.

31320173313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16479 (or 16473 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 27.

Adding to 31320173313 its reverse (31337102313), we get a palindrome (62657275626).

The spelling of 31320173313 in words is "thirty-one billion, three hundred twenty million, one hundred seventy-three thousand, three hundred thirteen".