31130230121 has 4 divisors (see below), whose sum is σ = 31657861200. Its totient is φ = 30602599044.

The previous prime is 31130230111. The next prime is 31130230139. The reversal of 31130230121 is 12103203113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31130230121 - 2¹⁸ = 31129967977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31130230121.

It is not an unprimeable number, because it can be changed into a prime (31130230111) 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, 263815451 + ... + 263815568.

It is an arithmetic number, because the mean of its divisors is an integer number (7914465300).

Almost surely, 2^31130230121 is an apocalyptic number.

It is an amenable number.

31130230121 is a deficient number, since it is larger than the sum of its proper divisors (527631079).

31130230121 is an equidigital number, since it uses as much as digits as its factorization.

31130230121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527631078.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31130230121 its reverse (12103203113), we get a palindrome (43233433234).

The spelling of 31130230121 in words is "thirty-one billion, one hundred thirty million, two hundred thirty thousand, one hundred twenty-one".