891945677 has 6 divisors (see below), whose sum is σ = 1037569518. Its totient is φ = 764524824.

The previous prime is 891945667. The next prime is 891945679. The reversal of 891945677 is 776549198.

It can be written as a sum of positive squares in only one way, i.e., 600936196 + 291009481 = 24514^2 + 17059^2 .

It is a de Polignac number, because none of the positive numbers 2^k-891945677 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 (891945679) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 9101438 + ... + 9101535.

It is an arithmetic number, because the mean of its divisors is an integer number (172928253).

Almost surely, 2^891945677 is an apocalyptic number.

It is an amenable number.

891945677 is a deficient number, since it is larger than the sum of its proper divisors (145623841).

891945677 is a wasteful number, since it uses less digits than its factorization.

891945677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18202987 (or 18202980 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 56.

The square root of 891945677 is about 29865.4595980038. The cubic root of 891945677 is about 962.6006153771.

The spelling of 891945677 in words is "eight hundred ninety-one million, nine hundred forty-five thousand, six hundred seventy-seven".