861651004 has 12 divisors (see below), whose sum is σ = 1513455328. Its totient is φ = 429235200.

The previous prime is 861650963. The next prime is 861651013. The reversal of 861651004 is 400156168.

861651004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 396357 + ... + 398524.

Almost surely, 2^861651004 is an apocalyptic number.

It is an amenable number.

861651004 is a deficient number, since it is larger than the sum of its proper divisors (651804324).

861651004 is a wasteful number, since it uses less digits than its factorization.

861651004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795156 (or 795154 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 861651004 is about 29353.8924846433. The cubic root of 861651004 is about 951.5766999187.

The spelling of 861651004 in words is "eight hundred sixty-one million, six hundred fifty-one thousand, four".