91247825 has 6 divisors (see below), whose sum is σ = 113147334. Its totient is φ = 72998240.

The previous prime is 91247797. The next prime is 91247843. The reversal of 91247825 is 52874219.

It can be written as a sum of positive squares in 3 ways, for example, as 83521 + 91164304 = 289^2 + 9548^2 .

It is not a de Polignac number, because 91247825 - 2¹⁰ = 91246801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1824932 + ... + 1824981.

It is an arithmetic number, because the mean of its divisors is an integer number (18857889).

Almost surely, 2^91247825 is an apocalyptic number.

It is an amenable number.

91247825 is a deficient number, since it is larger than the sum of its proper divisors (21899509).

91247825 is a wasteful number, since it uses less digits than its factorization.

91247825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649923 (or 3649918 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 91247825 is about 9552.3727418898. The cubic root of 91247825 is about 450.2020902997.

The spelling of 91247825 in words is "ninety-one million, two hundred forty-seven thousand, eight hundred twenty-five".