31311320133 has 8 divisors (see below), whose sum is σ = 41755003168. Its totient is φ = 20870925264.

The previous prime is 31311320113. The next prime is 31311320149. The reversal of 31311320133 is 33102311313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31311320133 - 2⁵ = 31311320101 is a prime.

It is a super-2 number, since 2×31311320133² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311320113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 799735 + ... + 837972.

It is an arithmetic number, because the mean of its divisors is an integer number (5219375396).

Almost surely, 2^31311320133 is an apocalyptic number.

It is an amenable number.

31311320133 is a deficient number, since it is larger than the sum of its proper divisors (10443683035).

31311320133 is a wasteful number, since it uses less digits than its factorization.

31311320133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644083.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31311320133 its reverse (33102311313), we get a palindrome (64413631446).

The spelling of 31311320133 in words is "thirty-one billion, three hundred eleven million, three hundred twenty thousand, one hundred thirty-three".