91649605 has 8 divisors (see below), whose sum is σ = 110378232. Its totient is φ = 73053888.

The previous prime is 91649603. The next prime is 91649617. The reversal of 91649605 is 50694619.

It can be written as a sum of positive squares in 4 ways, for example, as 1437601 + 90212004 = 1199^2 + 9498^2 .

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 91649605 - 2¹ = 91649603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91649603) 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, 31702 + ... + 34471.

It is an arithmetic number, because the mean of its divisors is an integer number (13797279).

Almost surely, 2^91649605 is an apocalyptic number.

It is an amenable number.

91649605 is a deficient number, since it is larger than the sum of its proper divisors (18728627).

91649605 is a wasteful number, since it uses less digits than its factorization.

91649605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66455.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 91649605 is about 9573.3800196169. The cubic root of 91649605 is about 450.8618954627.

It can be divided in two parts, 9164 and 9605, that added together give a square (18769 = 137²).

The spelling of 91649605 in words is "ninety-one million, six hundred forty-nine thousand, six hundred five".