231235551 has 6 divisors (see below), whose sum is σ = 334006920. Its totient is φ = 154157028.

The previous prime is 231235519. The next prime is 231235579. The reversal of 231235551 is 155532132.

It is a happy number.

It is not a de Polignac number, because 231235551 - 2⁵ = 231235519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231235591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12846411 + ... + 12846428.

It is an arithmetic number, because the mean of its divisors is an integer number (55667820).

Almost surely, 2^231235551 is an apocalyptic number.

231235551 is a deficient number, since it is larger than the sum of its proper divisors (102771369).

231235551 is a wasteful number, since it uses less digits than its factorization.

231235551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25692845 (or 25692842 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 231235551 is about 15206.4312381308. The cubic root of 231235551 is about 613.7877289687.

Adding to 231235551 its reverse (155532132), we get a palindrome (386767683).

The spelling of 231235551 in words is "two hundred thirty-one million, two hundred thirty-five thousand, five hundred fifty-one".