31130320233 has 32 divisors (see below), whose sum is σ = 44729395200. Its totient is φ = 19196312256.

The previous prime is 31130320181. The next prime is 31130320237. The reversal of 31130320233 is 33202303113.

It is not a de Polignac number, because 31130320233 - 2²⁶ = 31063211369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31130320237) 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, 1108635 + ... + 1136367.

It is an arithmetic number, because the mean of its divisors is an integer number (1397793600).

Almost surely, 2^31130320233 is an apocalyptic number.

It is an amenable number.

31130320233 is a deficient number, since it is larger than the sum of its proper divisors (13599074967).

31130320233 is a wasteful number, since it uses less digits than its factorization.

31130320233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28221.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 31130320233 its reverse (33202303113), we get a palindrome (64332623346).

The spelling of 31130320233 in words is "thirty-one billion, one hundred thirty million, three hundred twenty thousand, two hundred thirty-three".