91047 has 16 divisors (see below), whose sum is σ = 138240. Its totient is φ = 52800.

The previous prime is 91033. The next prime is 91079. The reversal of 91047 is 74019.

It is not a de Polignac number, because 91047 - 2¹⁰ = 90023 is a prime.

91047 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91097) 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, 979 + ... + 1067.

It is an arithmetic number, because the mean of its divisors is an integer number (8640).

2⁹¹⁰⁴⁷ is an apocalyptic number.

91047 is a deficient number, since it is larger than the sum of its proper divisors (47193).

91047 is a wasteful number, since it uses less digits than its factorization.

91047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 91047 is about 301.7399542653. The cubic root of 91047 is about 44.9871568287.

The spelling of 91047 in words is "ninety-one thousand, forty-seven".