91300091 has 4 divisors (see below), whose sum is σ = 94448400. Its totient is φ = 88151784.

The previous prime is 91300043. The next prime is 91300093. The reversal of 91300091 is 19000319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19000319 = 13 ⋅1461563.

It is a cyclic number.

It is not a de Polignac number, because 91300091 - 2¹⁴ = 91283707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91300093) 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, 1574111 + ... + 1574168.

It is an arithmetic number, because the mean of its divisors is an integer number (23612100).

Almost surely, 2^91300091 is an apocalyptic number.

91300091 is a deficient number, since it is larger than the sum of its proper divisors (3148309).

91300091 is a wasteful number, since it uses less digits than its factorization.

91300091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148308.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 91300091 is about 9555.1081103251. The cubic root of 91300091 is about 450.2880312385.

The spelling of 91300091 in words is "ninety-one million, three hundred thousand, ninety-one".