231381099 has 18 divisors (see below), whose sum is σ = 336551540. Its totient is φ = 153183888.

The previous prime is 231381061. The next prime is 231381103. The reversal of 231381099 is 990183132.

It is not a de Polignac number, because 231381099 - 2¹¹ = 231379051 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231381049) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 268932 + ... + 269790.

Almost surely, 2^231381099 is an apocalyptic number.

231381099 is a deficient number, since it is larger than the sum of its proper divisors (105170441).

231381099 is an equidigital number, since it uses as much as digits as its factorization.

231381099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 231381099 is about 15211.2162235635. The cubic root of 231381099 is about 613.9164820070.

The spelling of 231381099 in words is "two hundred thirty-one million, three hundred eighty-one thousand, ninety-nine".