861205137 has 16 divisors (see below), whose sum is σ = 1256877888. Its totient is φ = 521282880.

The previous prime is 861205129. The next prime is 861205157. The reversal of 861205137 is 731502168.

861205137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861205137 - 2³ = 861205129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861205098 and 861205107.

It is not an unprimeable number, because it can be changed into a prime (861205157) 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, 178623 + ... + 183380.

It is an arithmetic number, because the mean of its divisors is an integer number (78554868).

Almost surely, 2^861205137 is an apocalyptic number.

It is an amenable number.

861205137 is a deficient number, since it is larger than the sum of its proper divisors (395672751).

861205137 is a wasteful number, since it uses less digits than its factorization.

861205137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362080.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 861205137 is about 29346.2968191900. The cubic root of 861205137 is about 951.4125383849.

The spelling of 861205137 in words is "eight hundred sixty-one million, two hundred five thousand, one hundred thirty-seven".