31612123022161 has 4 divisors (see below), whose sum is σ = 34485952387824. Its totient is φ = 28738293656500.

The previous prime is 31612123022149. The next prime is 31612123022209. The reversal of 31612123022161 is 16122032121613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31612123022161 - 2¹³ = 31612123013969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31612123022141) 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, 1436914682815 + ... + 1436914682836.

It is an arithmetic number, because the mean of its divisors is an integer number (8621488096956).

Almost surely, 2^{31612123022161} is an apocalyptic number.

It is an amenable number.

31612123022161 is a deficient number, since it is larger than the sum of its proper divisors (2873829365663).

31612123022161 is a wasteful number, since it uses less digits than its factorization.

31612123022161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873829365662.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 31612123022161 its reverse (16122032121613), we get a palindrome (47734155143774).

The spelling of 31612123022161 in words is "thirty-one trillion, six hundred twelve billion, one hundred twenty-three million, twenty-two thousand, one hundred sixty-one".