891064136 has 8 divisors (see below), whose sum is σ = 1670745270. Its totient is φ = 445532064.

The previous prime is 891064127. The next prime is 891064157. The reversal of 891064136 is 631460198.

It can be written as a sum of positive squares in only one way, i.e., 818303236 + 72760900 = 28606^2 + 8530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 891064136.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55691501 + ... + 55691516.

Almost surely, 2^891064136 is an apocalyptic number.

It is an amenable number.

891064136 is a deficient number, since it is larger than the sum of its proper divisors (779681134).

891064136 is a wasteful number, since it uses less digits than its factorization.

891064136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111383023 (or 111383019 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 891064136 is about 29850.6974122884. The cubic root of 891064136 is about 962.2833869321.

The spelling of 891064136 in words is "eight hundred ninety-one million, sixty-four thousand, one hundred thirty-six".