91051 has 4 divisors (see below), whose sum is σ = 92232. Its totient is φ = 89872.

The previous prime is 91033. The next prime is 91079. The reversal of 91051 is 15019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15019 = 23 ⋅653.

It is a cyclic number.

It is not a de Polignac number, because 91051 - 2⁵ = 91019 is a prime.

It is a Duffinian number.

91051 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (91081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (23058).

2⁹¹⁰⁵¹ is an apocalyptic number.

91051 is a deficient number, since it is larger than the sum of its proper divisors (1181).

91051 is a wasteful number, since it uses less digits than its factorization.

91051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 91051 is about 301.7465824164. The cubic root of 91051 is about 44.9878156313.

It can be divided in two parts, 910 and 51, that added together give a square (961 = 31²).

The spelling of 91051 in words is "ninety-one thousand, fifty-one".