231402257 has 8 divisors (see below), whose sum is σ = 234474240. Its totient is φ = 228337200.

The previous prime is 231402253. The next prime is 231402271. The reversal of 231402257 is 752204132.

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

It is a cyclic number.

It is not a de Polignac number, because 231402257 - 2² = 231402253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231402253) 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, 117632 + ... + 119582.

It is an arithmetic number, because the mean of its divisors is an integer number (29309280).

Almost surely, 2^231402257 is an apocalyptic number.

It is an amenable number.

231402257 is a deficient number, since it is larger than the sum of its proper divisors (3071983).

231402257 is a wasteful number, since it uses less digits than its factorization.

231402257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 231402257 is about 15211.9116813108. The cubic root of 231402257 is about 613.9351940641.

Adding to 231402257 its reverse (752204132), we get a palindrome (983606389).

The spelling of 231402257 in words is "two hundred thirty-one million, four hundred two thousand, two hundred fifty-seven".