31146121 has 4 divisors (see below), whose sum is σ = 31166212. Its totient is φ = 31126032.

The previous prime is 31146113. The next prime is 31146127. The reversal of 31146121 is 12164113.

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 20976400 + 10169721 = 4580^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 31146121 - 2³ = 31146113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31146127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7506 + ... + 10891.

It is an arithmetic number, because the mean of its divisors is an integer number (7791553).

Almost surely, 2^31146121 is an apocalyptic number.

It is an amenable number.

31146121 is a deficient number, since it is larger than the sum of its proper divisors (20091).

31146121 is a wasteful number, since it uses less digits than its factorization.

31146121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20090.

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

The square root of 31146121 is about 5580.8709893707. The cubic root of 31146121 is about 314.6308634683.

The spelling of 31146121 in words is "thirty-one million, one hundred forty-six thousand, one hundred twenty-one".