231331464 has 160 divisors (see below), whose sum is σ = 797670720. Its totient is φ = 60994944.

The previous prime is 231331439. The next prime is 231331469. The reversal of 231331464 is 464133132.

231331464 = T₄₀₅ + T₄₀₆ + ... + T₁₁₃₂.

231331464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 (231331469) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 57007 + ... + 60929.

It is an arithmetic number, because the mean of its divisors is an integer number (4985442).

Almost surely, 2^231331464 is an apocalyptic number.

231331464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231331464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398835360).

231331464 is an abundant number, since it is smaller than the sum of its proper divisors (566339256).

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

231331464 is a wasteful number, since it uses less digits than its factorization.

231331464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961 (or 3948 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 231331464 is about 15209.5846097124. The cubic root of 231331464 is about 613.8725805189.

Adding to 231331464 its reverse (464133132), we get a palindrome (695464596).

The spelling of 231331464 in words is "two hundred thirty-one million, three hundred thirty-one thousand, four hundred sixty-four".