31231131103121 has 4 divisors (see below), whose sum is σ = 31231143239232. Its totient is φ = 31231118967012.

The previous prime is 31231131103079. The next prime is 31231131103163. The reversal of 31231131103121 is 12130113113213.

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, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (31231131103079) and next prime (31231131103163).

It is a cyclic number.

It is not a de Polignac number, because 31231131103121 - 2¹⁴ = 31231131086737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31231131103171) 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, 512501 + ... + 7919906.

It is an arithmetic number, because the mean of its divisors is an integer number (7807785809808).

Almost surely, 2^{31231131103121} is an apocalyptic number.

It is an amenable number.

31231131103121 is a deficient number, since it is larger than the sum of its proper divisors (12136111).

31231131103121 is an equidigital number, since it uses as much as digits as its factorization.

31231131103121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12136110.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 31231131103121 its reverse (12130113113213), we get a palindrome (43361244216334).

The spelling of 31231131103121 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred thirty-one million, one hundred three thousand, one hundred twenty-one".