231404322251 has 4 divisors (see below), whose sum is σ = 231970103400. Its totient is φ = 230838541104.

The previous prime is 231404322181. The next prime is 231404322271. The reversal of 231404322251 is 152223404132.

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

It is a cyclic number.

It is not a de Polignac number, because 231404322251 - 2²² = 231400127947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231404322271) 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, 282889961 + ... + 282890778.

It is an arithmetic number, because the mean of its divisors is an integer number (57992525850).

Almost surely, 2^231404322251 is an apocalyptic number.

231404322251 is a deficient number, since it is larger than the sum of its proper divisors (565781149).

231404322251 is an equidigital number, since it uses as much as digits as its factorization.

231404322251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565781148.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 231404322251 its reverse (152223404132), we get a palindrome (383627726383).

The spelling of 231404322251 in words is "two hundred thirty-one billion, four hundred four million, three hundred twenty-two thousand, two hundred fifty-one".