859963391 has 4 divisors (see below), whose sum is σ = 982815312. Its totient is φ = 737111472.

The previous prime is 859963381. The next prime is 859963441. The reversal of 859963391 is 193369958.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193369958 = 2 ⋅96684979.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-859963391 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859963331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61425950 + ... + 61425963.

It is an arithmetic number, because the mean of its divisors is an integer number (245703828).

Almost surely, 2^859963391 is an apocalyptic number.

859963391 is a deficient number, since it is larger than the sum of its proper divisors (122851921).

859963391 is a wasteful number, since it uses less digits than its factorization.

859963391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122851920.

The product of its digits is 1574640, while the sum is 53.

The square root of 859963391 is about 29325.1324123183. The cubic root of 859963391 is about 950.9550473130.

The spelling of 859963391 in words is "eight hundred fifty-nine million, nine hundred sixty-three thousand, three hundred ninety-one".