91243201 has 4 divisors (see below), whose sum is σ = 104277952. Its totient is φ = 78208452.

The previous prime is 91243181. The next prime is 91243241. The reversal of 91243201 is 10234219.

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: 10234219 = 239 ⋅42821.

It is not a de Polignac number, because 91243201 - 2⁵ = 91243169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91243241) 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, 6517365 + ... + 6517378.

It is an arithmetic number, because the mean of its divisors is an integer number (26069488).

Almost surely, 2^91243201 is an apocalyptic number.

It is an amenable number.

91243201 is a deficient number, since it is larger than the sum of its proper divisors (13034751).

91243201 is a wasteful number, since it uses less digits than its factorization.

91243201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13034750.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 91243201 is about 9552.1307047171. The cubic root of 91243201 is about 450.1944854805.

The spelling of 91243201 in words is "ninety-one million, two hundred forty-three thousand, two hundred one".