891140164 has 24 divisors (see below), whose sum is σ = 1585716440. Its totient is φ = 438137856.

The previous prime is 891140161. The next prime is 891140209. The reversal of 891140164 is 461041198.

It can be written as a sum of positive squares in 4 ways, for example, as 6553600 + 884586564 = 2560^2 + 29742^2 .

It is not an unprimeable number, because it can be changed into a prime (891140161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53602 + ... + 68230.

Almost surely, 2^891140164 is an apocalyptic number.

It is an amenable number.

891140164 is a deficient number, since it is larger than the sum of its proper divisors (694576276).

891140164 is a wasteful number, since it uses less digits than its factorization.

891140164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14887 (or 14885 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 891140164 is about 29851.9708562098. The cubic root of 891140164 is about 962.3107543601.

The spelling of 891140164 in words is "eight hundred ninety-one million, one hundred forty thousand, one hundred sixty-four".