236561121 has 16 divisors (see below), whose sum is σ = 355694400. Its totient is φ = 155352384.

The previous prime is 236561119. The next prime is 236561123. The reversal of 236561121 is 121165632.

236561121 is a `hidden beast` number, since 2 + 3 + 656 + 1 + 1 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (236561119) and next prime (236561123).

It is not a de Polignac number, because 236561121 - 2¹ = 236561119 is a prime.

It is a super-2 number, since 2×236561121² = 111922327937553282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (236561123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63576 + ... + 67193.

It is an arithmetic number, because the mean of its divisors is an integer number (22230900).

Almost surely, 2^236561121 is an apocalyptic number.

It is an amenable number.

236561121 is a deficient number, since it is larger than the sum of its proper divisors (119133279).

236561121 is a wasteful number, since it uses less digits than its factorization.

236561121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130845 (or 130839 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 236561121 is about 15380.5435859725. The cubic root of 236561121 is about 618.4640449095.

It can be divided in two parts, 2365611 and 21, that added together give a palindrome (2365632).

The spelling of 236561121 in words is "two hundred thirty-six million, five hundred sixty-one thousand, one hundred twenty-one".