91487645 has 8 divisors (see below), whose sum is σ = 109897656. Its totient is φ = 73115136.

The previous prime is 91487623. The next prime is 91487651. The reversal of 91487645 is 54678419.

It can be written as a sum of positive squares in 4 ways, for example, as 54848836 + 36638809 = 7406^2 + 6053^2 .

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 91487645 - 2¹⁶ = 91422109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91487596 and 91487605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3692 + ... + 14021.

It is an arithmetic number, because the mean of its divisors is an integer number (13737207).

Almost surely, 2^91487645 is an apocalyptic number.

It is an amenable number.

91487645 is a deficient number, since it is larger than the sum of its proper divisors (18410011).

91487645 is a wasteful number, since it uses less digits than its factorization.

91487645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18751.

The product of its digits is 241920, while the sum is 44.

The square root of 91487645 is about 9564.9174068572. The cubic root of 91487645 is about 450.5961563701.

The spelling of 91487645 in words is "ninety-one million, four hundred eighty-seven thousand, six hundred forty-five".