232506391 has 4 divisors (see below), whose sum is σ = 250391512. Its totient is φ = 214621272.

The previous prime is 232506377. The next prime is 232506457. The reversal of 232506391 is 193605232.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232506391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232516391) 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, 8942541 + ... + 8942566.

It is an arithmetic number, because the mean of its divisors is an integer number (62597878).

Almost surely, 2^232506391 is an apocalyptic number.

232506391 is a deficient number, since it is larger than the sum of its proper divisors (17885121).

232506391 is a wasteful number, since it uses less digits than its factorization.

232506391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17885120.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 232506391 is about 15248.1602496826. The cubic root of 232506391 is about 614.9101073804.

The spelling of 232506391 in words is "two hundred thirty-two million, five hundred six thousand, three hundred ninety-one".