236561 has 8 divisors (see below), whose sum is σ = 263424. Its totient is φ = 210960.

The previous prime is 236549. The next prime is 236563. The reversal of 236561 is 165632.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 236561 - 2¹⁰ = 235537 is a prime.

It is a super-2 number, since 2×236561² = 111922213442, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (236563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110 + ... + 696.

It is an arithmetic number, because the mean of its divisors is an integer number (32928).

2²³⁶⁵⁶¹ is an apocalyptic number.

It is an amenable number.

236561 is a deficient number, since it is larger than the sum of its proper divisors (26863).

236561 is a wasteful number, since it uses less digits than its factorization.

236561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631.

The product of its digits is 1080, while the sum is 23.

The square root of 236561 is about 486.3753694422. The cubic root of 236561 is about 61.8463939462.

It can be divided in two parts, 236 and 561, that added together give a palindrome (797).

The spelling of 236561 in words is "two hundred thirty-six thousand, five hundred sixty-one".