31983111161 has 4 divisors (see below), whose sum is σ = 31989501300. Its totient is φ = 31976721024.

The previous prime is 31983111137. The next prime is 31983111227. The reversal of 31983111161 is 16111138913.

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 25624005625 + 6359105536 = 160075^2 + 79744^2 .

It is a cyclic number.

It is not a de Polignac number, because 31983111161 - 2²² = 31978916857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31983111761) 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, 3187556 + ... + 3197573.

It is an arithmetic number, because the mean of its divisors is an integer number (7997375325).

Almost surely, 2^31983111161 is an apocalyptic number.

It is an amenable number.

31983111161 is a deficient number, since it is larger than the sum of its proper divisors (6390139).

31983111161 is an equidigital number, since it uses as much as digits as its factorization.

31983111161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390138.

The product of its digits is 3888, while the sum is 35.

The spelling of 31983111161 in words is "thirty-one billion, nine hundred eighty-three million, one hundred eleven thousand, one hundred sixty-one".