91245813 has 8 divisors (see below), whose sum is σ = 123655776. Its totient is φ = 59833200.

The previous prime is 91245773. The next prime is 91245821. The reversal of 91245813 is 31854219.

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

It is not a de Polignac number, because 91245813 - 2¹³ = 91237621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91245013) 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, 249123 + ... + 249488.

It is an arithmetic number, because the mean of its divisors is an integer number (15456972).

Almost surely, 2^91245813 is an apocalyptic number.

It is an amenable number.

91245813 is a deficient number, since it is larger than the sum of its proper divisors (32409963).

91245813 is a wasteful number, since it uses less digits than its factorization.

91245813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498675.

The product of its digits is 8640, while the sum is 33.

The square root of 91245813 is about 9552.2674271609. The cubic root of 91245813 is about 450.1987813140.

The spelling of 91245813 in words is "ninety-one million, two hundred forty-five thousand, eight hundred thirteen".