891170653 has 4 divisors (see below), whose sum is σ = 896149440. Its totient is φ = 886191868.

The previous prime is 891170647. The next prime is 891170659. The reversal of 891170653 is 356071198.

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 an interprime number because it is at equal distance from previous prime (891170647) and next prime (891170659).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891170653 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 (891170659) 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, 2489125 + ... + 2489482.

It is an arithmetic number, because the mean of its divisors is an integer number (224037360).

Almost surely, 2^891170653 is an apocalyptic number.

It is an amenable number.

891170653 is a deficient number, since it is larger than the sum of its proper divisors (4978787).

891170653 is a wasteful number, since it uses less digits than its factorization.

891170653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978786.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 891170653 is about 29852.4815216424. The cubic root of 891170653 is about 962.3217288993.

The spelling of 891170653 in words is "eight hundred ninety-one million, one hundred seventy thousand, six hundred fifty-three".