861199497 has 6 divisors (see below), whose sum is σ = 1243954842. Its totient is φ = 574132992.

The previous prime is 861199489. The next prime is 861199513. The reversal of 861199497 is 794991168.

861199497 is a `hidden beast` number, since 8 + 61 + 1 + 99 + 497 = 666.

861199497 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 only one way, i.e., 714813696 + 146385801 = 26736^2 + 12099^2 .

It is not a de Polignac number, because 861199497 - 2³ = 861199489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861199477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47844408 + ... + 47844425.

It is an arithmetic number, because the mean of its divisors is an integer number (207325807).

Almost surely, 2^861199497 is an apocalyptic number.

It is an amenable number.

861199497 is a deficient number, since it is larger than the sum of its proper divisors (382755345).

861199497 is a wasteful number, since it uses less digits than its factorization.

861199497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95688839 (or 95688836 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 861199497 is about 29346.2007251365. The cubic root of 861199497 is about 951.4104614588.

The spelling of 861199497 in words is "eight hundred sixty-one million, one hundred ninety-nine thousand, four hundred ninety-seven".