31573161 has 9 divisors (see below), whose sum is σ = 45630039. Its totient is φ = 21037536.

The previous prime is 31573153. The next prime is 31573163. The reversal of 31573161 is 16137513.

The square root of 31573161 is 5619.

It is a perfect power (a square), and thus also a powerful number.

31573161 is a `hidden beast` number, since 31 + 573 + 1 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 837225 + 30735936 = 915^2 + 5544^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 31573161 - 2³ = 31573153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31573163) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15921 + ... + 17793.

Almost surely, 2^31573161 is an apocalyptic number.

31573161 is the 5619-th square number.

31573161 is the 2810-th centered octagonal number.

It is an amenable number.

31573161 is a deficient number, since it is larger than the sum of its proper divisors (14056878).

31573161 is an frugal number, since it uses more digits than its factorization.

31573161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752 (or 1876 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The cubic root of 31573161 is about 316.0622941068.

The spelling of 31573161 in words is "thirty-one million, five hundred seventy-three thousand, one hundred sixty-one".