231742251 has 12 divisors (see below), whose sum is σ = 360488128. Its totient is φ = 142610544.

The previous prime is 231742243. The next prime is 231742261. The reversal of 231742251 is 152247132.

231742251 is a `hidden beast` number, since 231 + 7 + 422 + 5 + 1 = 666.

231742251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231742251 - 2³ = 231742243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231742261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 990235 + ... + 990468.

Almost surely, 2^231742251 is an apocalyptic number.

231742251 is a deficient number, since it is larger than the sum of its proper divisors (128745877).

231742251 is a wasteful number, since it uses less digits than its factorization.

231742251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980722 (or 1980719 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 231742251 is about 15223.0828349582. The cubic root of 231742251 is about 614.2357271977.

Adding to 231742251 its reverse (152247132), we get a palindrome (383989383).

It can be divided in two parts, 23174 and 2251, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 231742251 in words is "two hundred thirty-one million, seven hundred forty-two thousand, two hundred fifty-one".