91370243 has 2 divisors, whose sum is σ = 91370244. Its totient is φ = 91370242.

The previous prime is 91370197. The next prime is 91370249. The reversal of 91370243 is 34207319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91370243 - 2⁶ = 91370179 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (91370249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45685121 + 45685122.

It is an arithmetic number, because the mean of its divisors is an integer number (45685122).

Almost surely, 2^91370243 is an apocalyptic number.

91370243 is a deficient number, since it is larger than the sum of its proper divisors (1).

91370243 is an equidigital number, since it uses as much as digits as its factorization.

91370243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 91370243 is about 9558.7783215221. The cubic root of 91370243 is about 450.4033305718.

The spelling of 91370243 in words is "ninety-one million, three hundred seventy thousand, two hundred forty-three".