861159972 has 24 divisors (see below), whose sum is σ = 2011314592. Its totient is φ = 286776000.

The previous prime is 861159967. The next prime is 861159979. The reversal of 861159972 is 279951168.

It is not an unprimeable number, because it can be changed into a prime (861159979) 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 7 ways as a sum of consecutive naturals, for example, 21529 + ... + 46752.

Almost surely, 2^861159972 is an apocalyptic number.

It is an amenable number.

861159972 is an abundant number, since it is smaller than the sum of its proper divisors (1150154620).

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

861159972 is a wasteful number, since it uses less digits than its factorization.

861159972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69339 (or 69337 counting only the distinct ones).

The product of its digits is 272160, while the sum is 48.

The square root of 861159972 is about 29345.5272912245. The cubic root of 861159972 is about 951.3959061500.

The spelling of 861159972 in words is "eight hundred sixty-one million, one hundred fifty-nine thousand, nine hundred seventy-two".