91457249 has 4 divisors (see below), whose sum is σ = 98492436. Its totient is φ = 84422064.

The previous prime is 91457237. The next prime is 91457291. The reversal of 91457249 is 94275419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42667024 + 48790225 = 6532^2 + 6985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91457249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91457209) 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, 3517574 + ... + 3517599.

It is an arithmetic number, because the mean of its divisors is an integer number (24623109).

Almost surely, 2^91457249 is an apocalyptic number.

It is an amenable number.

91457249 is a deficient number, since it is larger than the sum of its proper divisors (7035187).

91457249 is a wasteful number, since it uses less digits than its factorization.

91457249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7035186.

The product of its digits is 90720, while the sum is 41.

The square root of 91457249 is about 9563.3283432077. The cubic root of 91457249 is about 450.5462485825.

The spelling of 91457249 in words is "ninety-one million, four hundred fifty-seven thousand, two hundred forty-nine".