231813380 has 12 divisors (see below), whose sum is σ = 486808140. Its totient is φ = 92725344.

The previous prime is 231813349. The next prime is 231813383. The reversal of 231813380 is 83318132.

It can be written as a sum of positive squares in 2 ways, for example, as 153561664 + 78251716 = 12392^2 + 8846^2 .

It is not an unprimeable number, because it can be changed into a prime (231813383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5795315 + ... + 5795354.

It is an arithmetic number, because the mean of its divisors is an integer number (40567345).

Almost surely, 2^231813380 is an apocalyptic number.

231813380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231813380 is an abundant number, since it is smaller than the sum of its proper divisors (254994760).

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

231813380 is a wasteful number, since it uses less digits than its factorization.

231813380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11590678 (or 11590676 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 231813380 is about 15225.4188776533. The cubic root of 231813380 is about 614.2985635366.

The spelling of 231813380 in words is "two hundred thirty-one million, eight hundred thirteen thousand, three hundred eighty".