31231131302131 has 4 divisors (see below), whose sum is σ = 31238933237512. Its totient is φ = 31223329366752.

The previous prime is 31231131302099. The next prime is 31231131302177. The reversal of 31231131302131 is 13120313113213.

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

It is a cyclic number.

It is not a de Polignac number, because 31231131302131 - 2⁵ = 31231131302099 is a prime.

It is a super-2 number, since 2×31231131302131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31231131302096 and 31231131302105.

It is not an unprimeable number, because it can be changed into a prime (31231131302731) 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, 3900961686 + ... + 3900969691.

It is an arithmetic number, because the mean of its divisors is an integer number (7809733309378).

Almost surely, 2^{31231131302131} is an apocalyptic number.

31231131302131 is a deficient number, since it is larger than the sum of its proper divisors (7801935381).

31231131302131 is an equidigital number, since it uses as much as digits as its factorization.

31231131302131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7801935380.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31231131302131 its reverse (13120313113213), we get a palindrome (44351444415344).

It can be divided in two parts, 3123113 and 1302131, that added together give a palindrome (4425244).

The spelling of 31231131302131 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred thirty-one million, three hundred two thousand, one hundred thirty-one".