861957105 has 16 divisors (see below), whose sum is σ = 1379500224. Its totient is φ = 459587520.

The previous prime is 861957091. The next prime is 861957113. The reversal of 861957105 is 501759168.

It is not a de Polignac number, because 861957105 - 2¹² = 861953009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91935 + ... + 100875.

It is an arithmetic number, because the mean of its divisors is an integer number (86218764).

Almost surely, 2^861957105 is an apocalyptic number.

It is an amenable number.

861957105 is a deficient number, since it is larger than the sum of its proper divisors (517543119).

861957105 is a wasteful number, since it uses less digits than its factorization.

861957105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15376.

The product of its (nonzero) digits is 75600, while the sum is 42.

The square root of 861957105 is about 29359.1059979694. The cubic root of 861957105 is about 951.6893689276.

The spelling of 861957105 in words is "eight hundred sixty-one million, nine hundred fifty-seven thousand, one hundred five".