861444159 has 16 divisors (see below), whose sum is σ = 1190640000. Its totient is φ = 553353696.

The previous prime is 861444127. The next prime is 861444163. The reversal of 861444159 is 951444168.

It is not a de Polignac number, because 861444159 - 2⁵ = 861444127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861444159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861444109) 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, 33492 + ... + 53334.

It is an arithmetic number, because the mean of its divisors is an integer number (74415000).

Almost surely, 2^861444159 is an apocalyptic number.

861444159 is a deficient number, since it is larger than the sum of its proper divisors (329195841).

861444159 is a wasteful number, since it uses less digits than its factorization.

861444159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20374.

The product of its digits is 138240, while the sum is 42.

The square root of 861444159 is about 29350.3689755342. The cubic root of 861444159 is about 951.5005497397.

Subtracting 861444159 from its reverse (951444168), we obtain a palindrome (90000009).

The spelling of 861444159 in words is "eight hundred sixty-one million, four hundred forty-four thousand, one hundred fifty-nine".