213572161 has 4 divisors (see below), whose sum is σ = 232987824. Its totient is φ = 194156500.

The previous prime is 213572159. The next prime is 213572221. The reversal of 213572161 is 161275312.

It is a happy number.

213572161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 213572161 - 2¹ = 213572159 is a prime.

It is a super-2 number, since 2×213572161² = 91226135908419842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213572461) 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, 9707815 + ... + 9707836.

It is an arithmetic number, because the mean of its divisors is an integer number (58246956).

Almost surely, 2^213572161 is an apocalyptic number.

It is an amenable number.

213572161 is a deficient number, since it is larger than the sum of its proper divisors (19415663).

213572161 is a wasteful number, since it uses less digits than its factorization.

213572161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19415662.

The product of its digits is 2520, while the sum is 28.

The square root of 213572161 is about 14614.1082861733. The cubic root of 213572161 is about 597.7435254350.

The spelling of 213572161 in words is "two hundred thirteen million, five hundred seventy-two thousand, one hundred sixty-one".