31320134331 has 32 divisors (see below), whose sum is σ = 45269199360. Its totient is φ = 19184546304.

The previous prime is 31320134327. The next prime is 31320134369. The reversal of 31320134331 is 13343102313.

It is a happy number.

It is not a de Polignac number, because 31320134331 - 2² = 31320134327 is a prime.

It is a super-2 number, since 2×31320134331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31320134371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7078986 + ... + 7083408.

It is an arithmetic number, because the mean of its divisors is an integer number (1414662480).

Almost surely, 2^31320134331 is an apocalyptic number.

31320134331 is a deficient number, since it is larger than the sum of its proper divisors (13949065029).

31320134331 is a wasteful number, since it uses less digits than its factorization.

31320134331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715.

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 31320134331 its reverse (13343102313), we get a palindrome (44663236644).

The spelling of 31320134331 in words is "thirty-one billion, three hundred twenty million, one hundred thirty-four thousand, three hundred thirty-one".