31265161 has 4 divisors (see below), whose sum is σ = 32343300. Its totient is φ = 30187024.

The previous prime is 31265147. The next prime is 31265167. The reversal of 31265161 is 16156213.

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 19404025 + 11861136 = 4405^2 + 3444^2 .

It is a cyclic number.

It is not a de Polignac number, because 31265161 - 2⁷ = 31265033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31265167) 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, 539026 + ... + 539083.

It is an arithmetic number, because the mean of its divisors is an integer number (8085825).

Almost surely, 2^31265161 is an apocalyptic number.

It is an amenable number.

31265161 is a deficient number, since it is larger than the sum of its proper divisors (1078139).

31265161 is a wasteful number, since it uses less digits than its factorization.

31265161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078138.

The product of its digits is 1080, while the sum is 25.

The square root of 31265161 is about 5591.5258203821. The cubic root of 31265161 is about 315.0311920065.

The spelling of 31265161 in words is "thirty-one million, two hundred sixty-five thousand, one hundred sixty-one".