31231130110013 has 4 divisors (see below), whose sum is σ = 33068255410620. Its totient is φ = 29394004809408.

The previous prime is 31231130109989. The next prime is 31231130110021. The reversal of 31231130110013 is 31001103113213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21876695626009 + 9354434484004 = 4677253^2 + 3058502^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231130110013 - 2²² = 31231125915709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231130110043) 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, 918562650278 + ... + 918562650311.

It is an arithmetic number, because the mean of its divisors is an integer number (8267063852655).

Almost surely, 2^{31231130110013} is an apocalyptic number.

It is an amenable number.

31231130110013 is a deficient number, since it is larger than the sum of its proper divisors (1837125300607).

31231130110013 is a wasteful number, since it uses less digits than its factorization.

31231130110013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837125300606.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 31231130110013 its reverse (31001103113213), we get a palindrome (62232233223226).

The spelling of 31231130110013 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred thirty million, one hundred ten thousand, thirteen".