861898137 has 32 divisors (see below), whose sum is σ = 1206835200. Its totient is φ = 546716352.

The previous prime is 861898133. The next prime is 861898139. The reversal of 861898137 is 731898168.

It is not a de Polignac number, because 861898137 - 2² = 861898133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861898137.

It is not an unprimeable number, because it can be changed into a prime (861898133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 740518 + ... + 741680.

It is an arithmetic number, because the mean of its divisors is an integer number (37713600).

Almost surely, 2^861898137 is an apocalyptic number.

It is an amenable number.

861898137 is a deficient number, since it is larger than the sum of its proper divisors (344937063).

861898137 is a wasteful number, since it uses less digits than its factorization.

861898137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357.

The product of its digits is 580608, while the sum is 51.

The square root of 861898137 is about 29358.1017267806. The cubic root of 861898137 is about 951.6676661854.

The spelling of 861898137 in words is "eight hundred sixty-one million, eight hundred ninety-eight thousand, one hundred thirty-seven".