225031161 has 4 divisors (see below), whose sum is σ = 300041552. Its totient is φ = 150020772.

The previous prime is 225031141. The next prime is 225031171. The reversal of 225031161 is 161130522.

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 not a de Polignac number, because 225031161 - 2⁷ = 225031033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225031141) 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, 37505191 + ... + 37505196.

It is an arithmetic number, because the mean of its divisors is an integer number (75010388).

Almost surely, 2^225031161 is an apocalyptic number.

It is an amenable number.

225031161 is a deficient number, since it is larger than the sum of its proper divisors (75010391).

225031161 is an equidigital number, since it uses as much as digits as its factorization.

225031161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75010390.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 225031161 is about 15001.0386640392. The cubic root of 225031161 is about 608.2482764088.

Adding to 225031161 its reverse (161130522), we get a palindrome (386161683).

It can be divided in two parts, 2250 and 31161, that added together give a triangular number (33411 = T₂₅₈).

The spelling of 225031161 in words is "two hundred twenty-five million, thirty-one thousand, one hundred sixty-one".