91356243 has 8 divisors (see below), whose sum is σ = 132881856. Its totient is φ = 55367400.

The previous prime is 91356233. The next prime is 91356247. The reversal of 91356243 is 34265319.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91356243 - 2⁴ = 91356227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2768371 = 91356243 / (9 + 1 + 3 + 5 + 6 + 2 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (91356247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384153 + ... + 1384218.

It is an arithmetic number, because the mean of its divisors is an integer number (16610232).

Almost surely, 2^91356243 is an apocalyptic number.

91356243 is a deficient number, since it is larger than the sum of its proper divisors (41525613).

91356243 is a wasteful number, since it uses less digits than its factorization.

91356243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768385.

The product of its digits is 19440, while the sum is 33.

The square root of 91356243 is about 9558.0459823125. The cubic root of 91356243 is about 450.3803253844.

The spelling of 91356243 in words is "ninety-one million, three hundred fifty-six thousand, two hundred forty-three".