91291253 has 4 divisors (see below), whose sum is σ = 91801440. Its totient is φ = 90781068.

The previous prime is 91291237. The next prime is 91291267. The reversal of 91291253 is 35219219.

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.

It is a cyclic number.

It is not a de Polignac number, because 91291253 - 2⁴ = 91291237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91291273) 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 3 ways as a sum of consecutive naturals, for example, 254825 + ... + 255182.

It is an arithmetic number, because the mean of its divisors is an integer number (22950360).

Almost surely, 2^91291253 is an apocalyptic number.

It is an amenable number.

91291253 is a deficient number, since it is larger than the sum of its proper divisors (510187).

91291253 is a wasteful number, since it uses less digits than its factorization.

91291253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510186.

The product of its digits is 4860, while the sum is 32.

The square root of 91291253 is about 9554.6456239884. The cubic root of 91291253 is about 450.2735012273.

The spelling of 91291253 in words is "ninety-one million, two hundred ninety-one thousand, two hundred fifty-three".