231642091 has 4 divisors (see below), whose sum is σ = 243833800. Its totient is φ = 219450384.

The previous prime is 231642079. The next prime is 231642101. The reversal of 231642091 is 190246132.

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-231642091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231642001) 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, 6095826 + ... + 6095863.

It is an arithmetic number, because the mean of its divisors is an integer number (60958450).

Almost surely, 2^231642091 is an apocalyptic number.

231642091 is a deficient number, since it is larger than the sum of its proper divisors (12191709).

231642091 is a wasteful number, since it uses less digits than its factorization.

231642091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12191708.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 231642091 is about 15219.7927384048. The cubic root of 231642091 is about 614.1472226693.

The spelling of 231642091 in words is "two hundred thirty-one million, six hundred forty-two thousand, ninety-one".