231864391 has 8 divisors (see below), whose sum is σ = 266256000. Its totient is φ = 199691640.

The previous prime is 231864379. The next prime is 231864431. The reversal of 231864391 is 193468132.

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 231864391 - 2¹³ = 231856199 is a prime.

It is a super-2 number, since 2×231864391² = 107522191627601762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231864391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231864331) 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, 554491 + ... + 554908.

It is an arithmetic number, because the mean of its divisors is an integer number (33282000).

Almost surely, 2^231864391 is an apocalyptic number.

231864391 is a deficient number, since it is larger than the sum of its proper divisors (34391609).

231864391 is a wasteful number, since it uses less digits than its factorization.

231864391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109429.

The product of its digits is 31104, while the sum is 37.

The square root of 231864391 is about 15227.0939775126. The cubic root of 231864391 is about 614.3436194429.

The spelling of 231864391 in words is "two hundred thirty-one million, eight hundred sixty-four thousand, three hundred ninety-one".