31213044632617 has 4 divisors (see below), whose sum is σ = 31264979815636. Its totient is φ = 31161109449600.

The previous prime is 31213044632563. The next prime is 31213044632639. The reversal of 31213044632617 is 71623644031213.

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 24557862336921 + 6655182295696 = 4955589^2 + 2579764^2 .

It is a cyclic number.

It is not a de Polignac number, because 31213044632617 - 2³¹ = 31210897148969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213044638617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25967590608 + ... + 25967591809.

It is an arithmetic number, because the mean of its divisors is an integer number (7816244953909).

Almost surely, 2^{31213044632617} is an apocalyptic number.

It is an amenable number.

31213044632617 is a deficient number, since it is larger than the sum of its proper divisors (51935183019).

31213044632617 is an equidigital number, since it uses as much as digits as its factorization.

31213044632617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51935183018.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 31213044632617 in words is "thirty-one trillion, two hundred thirteen billion, forty-four million, six hundred thirty-two thousand, six hundred seventeen".