231159820 has 12 divisors (see below), whose sum is σ = 485435664. Its totient is φ = 92463920.

The previous prime is 231159809. The next prime is 231159853. The reversal of 231159820 is 28951132.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5778976 + ... + 5779015.

It is an arithmetic number, because the mean of its divisors is an integer number (40452972).

Almost surely, 2^231159820 is an apocalyptic number.

231159820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231159820 is an abundant number, since it is smaller than the sum of its proper divisors (254275844).

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

231159820 is a wasteful number, since it uses less digits than its factorization.

231159820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11558000 (or 11557998 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 231159820 is about 15203.9409364809. The cubic root of 231159820 is about 613.7207152913.

The spelling of 231159820 in words is "two hundred thirty-one million, one hundred fifty-nine thousand, eight hundred twenty".