231785231 has 4 divisors (see below), whose sum is σ = 233477232. Its totient is φ = 230093232.

The previous prime is 231785221. The next prime is 231785263. The reversal of 231785231 is 132587132.

231785231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-231785231 is a prime.

It is a super-2 number, since 2×231785231² = 107448786619446722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231785201) 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, 845795 + ... + 846068.

It is an arithmetic number, because the mean of its divisors is an integer number (58369308).

Almost surely, 2^231785231 is an apocalyptic number.

231785231 is a deficient number, since it is larger than the sum of its proper divisors (1692001).

231785231 is a wasteful number, since it uses less digits than its factorization.

231785231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692000.

The product of its digits is 10080, while the sum is 32.

The square root of 231785231 is about 15224.4944415242. The cubic root of 231785231 is about 614.2736978591.

The spelling of 231785231 in words is "two hundred thirty-one million, seven hundred eighty-five thousand, two hundred thirty-one".