231197820 has 48 divisors (see below), whose sum is σ = 739834368. Its totient is φ = 52845120.

The previous prime is 231197809. The next prime is 231197843. The reversal of 231197820 is 28791132.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 274816 + ... + 275655.

It is an arithmetic number, because the mean of its divisors is an integer number (15413216).

Almost surely, 2^231197820 is an apocalyptic number.

231197820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231197820 is an abundant number, since it is smaller than the sum of its proper divisors (508636548).

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

231197820 is a wasteful number, since it uses less digits than its factorization.

231197820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550490 (or 550488 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 231197820 is about 15205.1905611209. The cubic root of 231197820 is about 613.7543429771.

The spelling of 231197820 in words is "two hundred thirty-one million, one hundred ninety-seven thousand, eight hundred twenty".