231099568272 has 120 divisors (see below), whose sum is σ = 654536431640. Its totient is φ = 76109414400.

The previous prime is 231099568261. The next prime is 231099568279. The reversal of 231099568272 is 272865990132.

231099568272 is a `hidden beast` number, since 2 + 3 + 1 + 0 + 9 + 9 + 568 + 2 + 72 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48927670416 + 182171897856 = 221196^2 + 426816^2 .

It is not an unprimeable number, because it can be changed into a prime (231099568279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8381004 + ... + 8408532.

Almost surely, 2^231099568272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231099568272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327268215820).

231099568272 is an abundant number, since it is smaller than the sum of its proper divisors (423436863368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231099568272 is a wasteful number, since it uses less digits than its factorization.

231099568272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28241 (or 28232 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 231099568272 in words is "two hundred thirty-one billion, ninety-nine million, five hundred sixty-eight thousand, two hundred seventy-two".