231541891 has 8 divisors (see below), whose sum is σ = 266524160. Its totient is φ = 197035848.

The previous prime is 231541879. The next prime is 231541927. The reversal of 231541891 is 198145132.

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 231541891 - 2⁷ = 231541763 is a prime.

It is a super-2 number, since 2×231541891² = 107223294575711762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231541831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118011 + ... + 119956.

It is an arithmetic number, because the mean of its divisors is an integer number (33315520).

Almost surely, 2^231541891 is an apocalyptic number.

231541891 is a deficient number, since it is larger than the sum of its proper divisors (34982269).

231541891 is a wasteful number, since it uses less digits than its factorization.

231541891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238113.

The product of its digits is 8640, while the sum is 34.

The square root of 231541891 is about 15216.5006161075. The cubic root of 231541891 is about 614.0586572643.

The spelling of 231541891 in words is "two hundred thirty-one million, five hundred forty-one thousand, eight hundred ninety-one".