91249807 has 8 divisors (see below), whose sum is σ = 102236112. Its totient is φ = 80712000.

The previous prime is 91249801. The next prime is 91249817. The reversal of 91249807 is 70894219.

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

It is a cyclic number.

It is not a de Polignac number, because 91249807 - 2¹⁹ = 90725519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91249807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91249801) 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, 111694 + ... + 112507.

It is an arithmetic number, because the mean of its divisors is an integer number (12779514).

Almost surely, 2^91249807 is an apocalyptic number.

91249807 is a deficient number, since it is larger than the sum of its proper divisors (10986305).

91249807 is a wasteful number, since it uses less digits than its factorization.

91249807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224249.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 91249807 is about 9552.4764851844. The cubic root of 91249807 is about 450.2053498992.

The spelling of 91249807 in words is "ninety-one million, two hundred forty-nine thousand, eight hundred seven".