233640631 has 4 divisors (see below), whose sum is σ = 267017872. Its totient is φ = 200263392.

The previous prime is 233640613. The next prime is 233640637. The reversal of 233640631 is 136046332.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 233640631 - 2⁹ = 233640119 is a prime.

It is a super-2 number, since 2×233640631² = 109175888908156322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 233640631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233640637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16688610 + ... + 16688623.

It is an arithmetic number, because the mean of its divisors is an integer number (66754468).

Almost surely, 2^233640631 is an apocalyptic number.

233640631 is a deficient number, since it is larger than the sum of its proper divisors (33377241).

233640631 is an equidigital number, since it uses as much as digits as its factorization.

233640631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33377240.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 233640631 is about 15285.3076841783. The cubic root of 233640631 is about 615.9083947311.

Adding to 233640631 its reverse (136046332), we get a palindrome (369686963).

The spelling of 233640631 in words is "two hundred thirty-three million, six hundred forty thousand, six hundred thirty-one".