861091612 has 6 divisors (see below), whose sum is σ = 1506910328. Its totient is φ = 430545804.

The previous prime is 861091591. The next prime is 861091631. The reversal of 861091612 is 216190168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107636448 + ... + 107636455.

Almost surely, 2^861091612 is an apocalyptic number.

It is an amenable number.

861091612 is a deficient number, since it is larger than the sum of its proper divisors (645818716).

861091612 is a wasteful number, since it uses less digits than its factorization.

861091612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215272907 (or 215272905 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 861091612 is about 29344.3625250234. The cubic root of 861091612 is about 951.3707311352.

The spelling of 861091612 in words is "eight hundred sixty-one million, ninety-one thousand, six hundred twelve".