899191945 has 16 divisors (see below), whose sum is σ = 1115029440. Its totient is φ = 695594304.

The previous prime is 899191939. The next prime is 899191987. The reversal of 899191945 is 549191998.

It is a cyclic number.

It is not a de Polignac number, because 899191945 - 2¹⁹ = 898667657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15246 + ... + 45064.

It is an arithmetic number, because the mean of its divisors is an integer number (69689340).

Almost surely, 2^899191945 is an apocalyptic number.

It is an amenable number.

899191945 is a deficient number, since it is larger than the sum of its proper divisors (215837495).

899191945 is a wasteful number, since it uses less digits than its factorization.

899191945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30024.

The product of its digits is 1049760, while the sum is 55.

The square root of 899191945 is about 29986.5293923788. The cubic root of 899191945 is about 965.2003467798.

The spelling of 899191945 in words is "eight hundred ninety-nine million, one hundred ninety-one thousand, nine hundred forty-five".