91344257 has 4 divisors (see below), whose sum is σ = 91372080. Its totient is φ = 91316436.

The previous prime is 91344241. The next prime is 91344283. The reversal of 91344257 is 75244319.

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 91344257 - 2⁴ = 91344241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91344217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8207 + ... + 15812.

It is an arithmetic number, because the mean of its divisors is an integer number (22843020).

Almost surely, 2^91344257 is an apocalyptic number.

It is an amenable number.

91344257 is a deficient number, since it is larger than the sum of its proper divisors (27823).

91344257 is a wasteful number, since it uses less digits than its factorization.

91344257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27822.

The product of its digits is 30240, while the sum is 35.

The square root of 91344257 is about 9557.4189507419. The cubic root of 91344257 is about 450.3606277899.

The spelling of 91344257 in words is "ninety-one million, three hundred forty-four thousand, two hundred fifty-seven".