891052507 has 4 divisors (see below), whose sum is σ = 891113440. Its totient is φ = 890991576.

The previous prime is 891052439. The next prime is 891052529. The reversal of 891052507 is 705250198.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(891052507) divides (891052507-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891052507 is a prime.

It is a deceptive number, since it divides R_891052506.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891052567) 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, 6094 + ... + 42652.

It is an arithmetic number, because the mean of its divisors is an integer number (222778360).

Almost surely, 2^891052507 is an apocalyptic number.

891052507 is the 24373-rd pentagonal number.

891052507 is a deficient number, since it is larger than the sum of its proper divisors (60933).

891052507 is a wasteful number, since it uses less digits than its factorization.

891052507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60932.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 891052507 is about 29850.5026255840. The cubic root of 891052507 is about 962.2792007605.

The spelling of 891052507 in words is "eight hundred ninety-one million, fifty-two thousand, five hundred seven".