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91157 = 118287
BaseRepresentation
bin10110010000010101
311122001012
4112100111
510404112
61542005
7526523
oct262025
9148035
1091157
1162540
1244905
1332651
1425313
151c022
hex16415

91157 has 4 divisors (see below), whose sum is σ = 99456. Its totient is φ = 82860.

The previous prime is 91153. The next prime is 91159. The reversal of 91157 is 75119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75119 = 116829.

It is a cyclic number.

It is not a de Polignac number, because 91157 - 22 = 91153 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 (91151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4133 + ... + 4154.

It is an arithmetic number, because the mean of its divisors is an integer number (24864).

291157 is an apocalyptic number.

It is an amenable number.

91157 is a deficient number, since it is larger than the sum of its proper divisors (8299).

91157 is a wasteful number, since it uses less digits than its factorization.

91157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8298.

The product of its digits is 315, while the sum is 23.

The square root of 91157 is about 301.9221754029. The cubic root of 91157 is about 45.0052668732.

The spelling of 91157 in words is "ninety-one thousand, one hundred fifty-seven".

Divisors: 1 11 8287 91157