231135251 has 4 divisors (see below), whose sum is σ = 231165672. Its totient is φ = 231104832.

The previous prime is 231135239. The next prime is 231135253. The reversal of 231135251 is 152531132.

It is a happy number.

231135251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231135251 - 2⁶ = 231135187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231135253) 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, 6920 + ... + 22586.

It is an arithmetic number, because the mean of its divisors is an integer number (57791418).

Almost surely, 2^231135251 is an apocalyptic number.

231135251 is a deficient number, since it is larger than the sum of its proper divisors (30421).

231135251 is a wasteful number, since it uses less digits than its factorization.

231135251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30420.

The product of its digits is 900, while the sum is 23.

The square root of 231135251 is about 15203.1329337081. The cubic root of 231135251 is about 613.6989712609.

Adding to 231135251 its reverse (152531132), we get a palindrome (383666383).

The spelling of 231135251 in words is "two hundred thirty-one million, one hundred thirty-five thousand, two hundred fifty-one".