861913589 has 4 divisors (see below), whose sum is σ = 880252224. Its totient is φ = 843574956.

The previous prime is 861913571. The next prime is 861913597. The reversal of 861913589 is 985319168.

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 not a de Polignac number, because 861913589 - 2²⁸ = 593478133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861913529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9169247 + ... + 9169340.

It is an arithmetic number, because the mean of its divisors is an integer number (220063056).

Almost surely, 2^861913589 is an apocalyptic number.

It is an amenable number.

861913589 is a deficient number, since it is larger than the sum of its proper divisors (18338635).

861913589 is a wasteful number, since it uses less digits than its factorization.

861913589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18338634.

The product of its digits is 466560, while the sum is 50.

The square root of 861913589 is about 29358.3648897550. The cubic root of 861913589 is about 951.6733532770.

The spelling of 861913589 in words is "eight hundred sixty-one million, nine hundred thirteen thousand, five hundred eighty-nine".