861231908 has 12 divisors (see below), whose sum is σ = 1559126940. Its totient is φ = 415767072.

The previous prime is 861231893. The next prime is 861231919. The reversal of 861231908 is 809132168.

861231908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 714385984 + 146845924 = 26728^2 + 12118^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3712091 + ... + 3712322.

It is an arithmetic number, because the mean of its divisors is an integer number (129927245).

Almost surely, 2^861231908 is an apocalyptic number.

It is an amenable number.

861231908 is a deficient number, since it is larger than the sum of its proper divisors (697895032).

861231908 is a wasteful number, since it uses less digits than its factorization.

861231908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7424446 (or 7424444 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 861231908 is about 29346.7529379317. The cubic root of 861231908 is about 951.4223966638.

The spelling of 861231908 in words is "eight hundred sixty-one million, two hundred thirty-one thousand, nine hundred eight".