891385513 has 4 divisors (see below), whose sum is σ = 938300560. Its totient is φ = 844470468.

The previous prime is 891385507. The next prime is 891385591. The reversal of 891385513 is 315583198.

891385513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-891385513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891385513.

It is not an unprimeable number, because it can be changed into a prime (891385213) 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, 23457495 + ... + 23457532.

It is an arithmetic number, because the mean of its divisors is an integer number (234575140).

Almost surely, 2^891385513 is an apocalyptic number.

It is an amenable number.

891385513 is a deficient number, since it is larger than the sum of its proper divisors (46915047).

891385513 is a wasteful number, since it uses less digits than its factorization.

891385513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46915046.

The product of its digits is 129600, while the sum is 43.

The square root of 891385513 is about 29856.0800005627. The cubic root of 891385513 is about 962.3990608264.

The spelling of 891385513 in words is "eight hundred ninety-one million, three hundred eighty-five thousand, five hundred thirteen".