231366520 has 96 divisors (see below), whose sum is σ = 654040800. Its totient is φ = 72103680.

The previous prime is 231366517. The next prime is 231366523. The reversal of 231366520 is 25663132.

It is an interprime number because it is at equal distance from previous prime (231366517) and next prime (231366523).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231366523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30466 + ... + 37294.

It is an arithmetic number, because the mean of its divisors is an integer number (6812925).

Almost surely, 2^231366520 is an apocalyptic number.

231366520 is a gapful number since it is divisible by the number (20) 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 231366520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327020400).

231366520 is an abundant number, since it is smaller than the sum of its proper divisors (422674280).

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

231366520 is a wasteful number, since it uses less digits than its factorization.

231366520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6869 (or 6854 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 231366520 is about 15210.7369972661. The cubic root of 231366520 is about 613.9035877294.

The spelling of 231366520 in words is "two hundred thirty-one million, three hundred sixty-six thousand, five hundred twenty".