31164121 has 4 divisors (see below), whose sum is σ = 31888912. Its totient is φ = 30439332.

The previous prime is 31164109. The next prime is 31164127. The reversal of 31164121 is 12146113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12146113 = 7 ⋅1735159.

It is a cyclic number.

It is not a de Polignac number, because 31164121 - 2⁹ = 31163609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31164127) 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, 362331 + ... + 362416.

It is an arithmetic number, because the mean of its divisors is an integer number (7972228).

Almost surely, 2^31164121 is an apocalyptic number.

It is an amenable number.

31164121 is a deficient number, since it is larger than the sum of its proper divisors (724791).

31164121 is an equidigital number, since it uses as much as digits as its factorization.

31164121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724790.

The product of its digits is 144, while the sum is 19.

The square root of 31164121 is about 5582.4834079467. The cubic root of 31164121 is about 314.6914623992.

The spelling of 31164121 in words is "thirty-one million, one hundred sixty-four thousand, one hundred twenty-one".