31231311297 has 16 divisors (see below), whose sum is σ = 42151330368. Its totient is φ = 20566177280.

The previous prime is 31231311283. The next prime is 31231311403. The reversal of 31231311297 is 79211313213.

It is a cyclic number.

It is not a de Polignac number, because 31231311297 - 2¹² = 31231307201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31231311247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2052397 + ... + 2067557.

It is an arithmetic number, because the mean of its divisors is an integer number (2634458148).

Almost surely, 2^31231311297 is an apocalyptic number.

It is an amenable number.

31231311297 is a deficient number, since it is larger than the sum of its proper divisors (10920019071).

31231311297 is a wasteful number, since it uses less digits than its factorization.

31231311297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23520.

The product of its digits is 6804, while the sum is 33.

It can be divided in two parts, 312313 and 11297, that added together give a triangular number (323610 = T₈₀₄).

The spelling of 31231311297 in words is "thirty-one billion, two hundred thirty-one million, three hundred eleven thousand, two hundred ninety-seven".