91010857 has 16 divisors (see below), whose sum is σ = 108162432. Its totient is φ = 74954880.

The previous prime is 91010849. The next prime is 91010869. The reversal of 91010857 is 75801019.

It is not a de Polignac number, because 91010857 - 2³ = 91010849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91010837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16863 + ... + 21595.

It is an arithmetic number, because the mean of its divisors is an integer number (6760152).

Almost surely, 2^91010857 is an apocalyptic number.

It is an amenable number.

91010857 is a deficient number, since it is larger than the sum of its proper divisors (17151575).

91010857 is a wasteful number, since it uses less digits than its factorization.

91010857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4848.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 91010857 is about 9539.9610586207. The cubic root of 91010857 is about 449.8120317833.

The spelling of 91010857 in words is "ninety-one million, ten thousand, eight hundred fifty-seven".