31131652465 has 4 divisors (see below), whose sum is σ = 37357982964. Its totient is φ = 24905321968.

The previous prime is 31131652429. The next prime is 31131652469. The reversal of 31131652465 is 56425613113.

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 13059689841 + 18071962624 = 114279^2 + 134432^2 .

It is a cyclic number.

It is not a de Polignac number, because 31131652465 - 2³¹ = 28984168817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131652469) 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, 3113165242 + ... + 3113165251.

It is an arithmetic number, because the mean of its divisors is an integer number (9339495741).

Almost surely, 2^31131652465 is an apocalyptic number.

It is an amenable number.

31131652465 is a deficient number, since it is larger than the sum of its proper divisors (6226330499).

31131652465 is an equidigital number, since it uses as much as digits as its factorization.

31131652465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226330498.

The product of its digits is 64800, while the sum is 37.

The spelling of 31131652465 in words is "thirty-one billion, one hundred thirty-one million, six hundred fifty-two thousand, four hundred sixty-five".