861161799 has 16 divisors (see below), whose sum is σ = 1159441920. Its totient is φ = 568520160.

The previous prime is 861161773. The next prime is 861161831. The reversal of 861161799 is 997161168.

It is not a de Polignac number, because 861161799 - 2⁵ = 861161767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861161759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143542 + ... + 149420.

It is an arithmetic number, because the mean of its divisors is an integer number (72465120).

Almost surely, 2^861161799 is an apocalyptic number.

861161799 is a deficient number, since it is larger than the sum of its proper divisors (298280121).

861161799 is a wasteful number, since it uses less digits than its factorization.

861161799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6350.

The product of its digits is 163296, while the sum is 48.

The square root of 861161799 is about 29345.5584203129. The cubic root of 861161799 is about 951.3965789631.

The spelling of 861161799 in words is "eight hundred sixty-one million, one hundred sixty-one thousand, seven hundred ninety-nine".