391255231 has 8 divisors (see below), whose sum is σ = 410024160. Its totient is φ = 372632832.

The previous prime is 391255217. The next prime is 391255259. The reversal of 391255231 is 132552193.

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 391255231 - 2²¹ = 389158079 is a prime.

It is a super-2 number, since 2×391255231² = 306161311569726722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391255193 and 391255202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391255331) 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, 31146 + ... + 41863.

It is an arithmetic number, because the mean of its divisors is an integer number (51253020).

Almost surely, 2^391255231 is an apocalyptic number.

391255231 is a deficient number, since it is larger than the sum of its proper divisors (18768929).

391255231 is a wasteful number, since it uses less digits than its factorization.

391255231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73265.

The product of its digits is 8100, while the sum is 31.

The square root of 391255231 is about 19780.1726736649. The cubic root of 391255231 is about 731.3973553968.

The spelling of 391255231 in words is "three hundred ninety-one million, two hundred fifty-five thousand, two hundred thirty-one".