231240251 has 8 divisors (see below), whose sum is σ = 252706224. Its totient is φ = 209848320.

The previous prime is 231240199. The next prime is 231240263. The reversal of 231240251 is 152042132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-231240251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231240281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11870 + ... + 24563.

It is an arithmetic number, because the mean of its divisors is an integer number (31588278).

Almost surely, 2^231240251 is an apocalyptic number.

231240251 is a deficient number, since it is larger than the sum of its proper divisors (21465973).

231240251 is a wasteful number, since it uses less digits than its factorization.

231240251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37021.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 231240251 is about 15206.5857772217. The cubic root of 231240251 is about 613.7918874740.

Adding to 231240251 its reverse (152042132), we get a palindrome (383282383).

The spelling of 231240251 in words is "two hundred thirty-one million, two hundred forty thousand, two hundred fifty-one".