31130331331 has 4 divisors (see below), whose sum is σ = 33960361464. Its totient is φ = 28300301200.

The previous prime is 31130331319. The next prime is 31130331373. The reversal of 31130331331 is 13313303113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31130331331 is a prime.

It is a super-2 number, since 2×31130331331² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31130331301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415015050 + ... + 1415015071.

It is an arithmetic number, because the mean of its divisors is an integer number (8490090366).

Almost surely, 2^31130331331 is an apocalyptic number.

31130331331 is a deficient number, since it is larger than the sum of its proper divisors (2830030133).

31130331331 is a wasteful number, since it uses less digits than its factorization.

31130331331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830030132.

The product of its (nonzero) digits is 729, while the sum is 22.

Adding to 31130331331 its reverse (13313303113), we get a palindrome (44443634444).

The spelling of 31130331331 in words is "thirty-one billion, one hundred thirty million, three hundred thirty-one thousand, three hundred thirty-one".