861421165 has 16 divisors (see below), whose sum is σ = 1130279040. Its totient is φ = 625043520.

The previous prime is 861421157. The next prime is 861421213. The reversal of 861421165 is 561124168.

It is not a de Polignac number, because 861421165 - 2³ = 861421157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861421165.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6307 + ... + 41983.

It is an arithmetic number, because the mean of its divisors is an integer number (70642440).

Almost surely, 2^861421165 is an apocalyptic number.

It is an amenable number.

861421165 is a deficient number, since it is larger than the sum of its proper divisors (268857875).

861421165 is a wasteful number, since it uses less digits than its factorization.

861421165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36132.

The product of its digits is 11520, while the sum is 34.

The square root of 861421165 is about 29349.9772572314. The cubic root of 861421165 is about 951.4920837244.

The spelling of 861421165 in words is "eight hundred sixty-one million, four hundred twenty-one thousand, one hundred sixty-five".