861563137 has 4 divisors (see below), whose sum is σ = 865892800. Its totient is φ = 857233476.

The previous prime is 861563123. The next prime is 861563221. The reversal of 861563137 is 731365168.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861563137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861563137.

It is not an unprimeable number, because it can be changed into a prime (861563737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2164533 + ... + 2164930.

It is an arithmetic number, because the mean of its divisors is an integer number (216473200).

Almost surely, 2^861563137 is an apocalyptic number.

It is an amenable number.

861563137 is a deficient number, since it is larger than the sum of its proper divisors (4329663).

861563137 is a wasteful number, since it uses less digits than its factorization.

861563137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4329662.

The product of its digits is 90720, while the sum is 40.

The square root of 861563137 is about 29352.3957625268. The cubic root of 861563137 is about 951.5443530900.

The spelling of 861563137 in words is "eight hundred sixty-one million, five hundred sixty-three thousand, one hundred thirty-seven".