231613992 has 96 divisors (see below), whose sum is σ = 654370080. Its totient is φ = 76749120.

The previous prime is 231613951. The next prime is 231613997. The reversal of 231613992 is 299316132.

It is a happy number.

231613992 is a `hidden beast` number, since 2 + 31 + 613 + 9 + 9 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (231613997) 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 23 ways as a sum of consecutive naturals, for example, 549942 + ... + 550362.

It is an arithmetic number, because the mean of its divisors is an integer number (6816355).

Almost surely, 2^231613992 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 231613992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327185040).

231613992 is an abundant number, since it is smaller than the sum of its proper divisors (422756088).

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

231613992 is a wasteful number, since it uses less digits than its factorization.

231613992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 709 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 231613992 is about 15218.8696032261. The cubic root of 231613992 is about 614.1223889261.

The spelling of 231613992 in words is "two hundred thirty-one million, six hundred thirteen thousand, nine hundred ninety-two".