231165561091 has 8 divisors (see below), whose sum is σ = 231332381280. Its totient is φ = 230998804608.

The previous prime is 231165561089. The next prime is 231165561161. The reversal of 231165561091 is 190165561132.

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 231165561091 - 2¹ = 231165561089 is a prime.

It is a super-2 number, since 2×231165561091² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231165561061) 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, 8975965 + ... + 9001681.

It is an arithmetic number, because the mean of its divisors is an integer number (28916547660).

Almost surely, 2^231165561091 is an apocalyptic number.

231165561091 is a deficient number, since it is larger than the sum of its proper divisors (166820189).

231165561091 is a wasteful number, since it uses less digits than its factorization.

231165561091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31853.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 231165561091 in words is "two hundred thirty-one billion, one hundred sixty-five million, five hundred sixty-one thousand, ninety-one".