31911617377 has 4 divisors (see below), whose sum is σ = 31912502980. Its totient is φ = 31910731776.

The previous prime is 31911617369. The next prime is 31911617383. The reversal of 31911617377 is 77371611913.

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 20091361536 + 11820255841 = 141744^2 + 108721^2 .

It is a cyclic number.

It is not a de Polignac number, because 31911617377 - 2³ = 31911617369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31911617327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386352 + ... + 461617.

It is an arithmetic number, because the mean of its divisors is an integer number (7978125745).

Almost surely, 2^31911617377 is an apocalyptic number.

It is an amenable number.

31911617377 is a deficient number, since it is larger than the sum of its proper divisors (885603).

31911617377 is an equidigital number, since it uses as much as digits as its factorization.

31911617377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885602.

The product of its digits is 166698, while the sum is 46.

The spelling of 31911617377 in words is "thirty-one billion, nine hundred eleven million, six hundred seventeen thousand, three hundred seventy-seven".