891155657 has 16 divisors (see below), whose sum is σ = 1079729280. Its totient is φ = 718011648.

The previous prime is 891155653. The next prime is 891155669. The reversal of 891155657 is 756551198.

It is a cyclic number.

It is not a de Polignac number, because 891155657 - 2² = 891155653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (891155653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100094 + ... + 108632.

It is an arithmetic number, because the mean of its divisors is an integer number (67483080).

Almost surely, 2^891155657 is an apocalyptic number.

It is an amenable number.

891155657 is a deficient number, since it is larger than the sum of its proper divisors (188573623).

891155657 is a wasteful number, since it uses less digits than its factorization.

891155657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9440.

The product of its digits is 378000, while the sum is 47.

The square root of 891155657 is about 29852.2303521864. The cubic root of 891155657 is about 962.3163311087.

The spelling of 891155657 in words is "eight hundred ninety-one million, one hundred fifty-five thousand, six hundred fifty-seven".