31665306121 has 4 divisors (see below), whose sum is σ = 33331901200. Its totient is φ = 29998711044.

The previous prime is 31665306073. The next prime is 31665306157. The reversal of 31665306121 is 12160356613.

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 31665306121 - 2²⁹ = 31128435209 is a prime.

It is a super-2 number, since 2×31665306121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31665306191) 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, 833297511 + ... + 833297548.

It is an arithmetic number, because the mean of its divisors is an integer number (8332975300).

Almost surely, 2^31665306121 is an apocalyptic number.

It is an amenable number.

31665306121 is a deficient number, since it is larger than the sum of its proper divisors (1666595079).

31665306121 is a wasteful number, since it uses less digits than its factorization.

31665306121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666595078.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 31665306121 in words is "thirty-one billion, six hundred sixty-five million, three hundred six thousand, one hundred twenty-one".