231323136 has 80 divisors (see below), whose sum is σ = 672331968. Its totient is φ = 70092800.

The previous prime is 231323123. The next prime is 231323137. The reversal of 231323136 is 631323132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231323137) 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, 10051 + ... + 23741.

Almost surely, 2^231323136 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 231323136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336165984).

231323136 is an abundant number, since it is smaller than the sum of its proper divisors (441008832).

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

231323136 is a wasteful number, since it uses less digits than its factorization.

231323136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13723 (or 13707 counting only the distinct ones).

The product of its digits is 1944, while the sum is 24.

The square root of 231323136 is about 15209.3108325131. The cubic root of 231323136 is about 613.8652139000.

Adding to 231323136 its reverse (631323132), we get a palindrome (862646268).

The spelling of 231323136 in words is "two hundred thirty-one million, three hundred twenty-three thousand, one hundred thirty-six".