236561161 has 4 divisors (see below), whose sum is σ = 236625300. Its totient is φ = 236497024.

The previous prime is 236561131. The next prime is 236561167. The reversal of 236561161 is 161165632.

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 9486400 + 227074761 = 3080^2 + 15069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-236561161 is a prime.

It is a super-2 number, since 2×236561161² = 111922365787335842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (236561167) 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, 26176 + ... + 34033.

It is an arithmetic number, because the mean of its divisors is an integer number (59156325).

Almost surely, 2^236561161 is an apocalyptic number.

It is an amenable number.

236561161 is a deficient number, since it is larger than the sum of its proper divisors (64139).

236561161 is an equidigital number, since it uses as much as digits as its factorization.

236561161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64138.

The product of its digits is 6480, while the sum is 31.

The square root of 236561161 is about 15380.5448863166. The cubic root of 236561161 is about 618.4640797681.

The spelling of 236561161 in words is "two hundred thirty-six million, five hundred sixty-one thousand, one hundred sixty-one".