91509649 has 16 divisors (see below), whose sum is σ = 116029440. Its totient is φ = 70094160.

The previous prime is 91509559. The next prime is 91509659. The reversal of 91509649 is 94690519.

It is a cyclic number.

It is not a de Polignac number, because 91509649 - 2⁹ = 91509137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91509659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5529 + ... + 14614.

It is an arithmetic number, because the mean of its divisors is an integer number (7251840).

Almost surely, 2^91509649 is an apocalyptic number.

It is an amenable number.

91509649 is a deficient number, since it is larger than the sum of its proper divisors (24519791).

91509649 is a wasteful number, since it uses less digits than its factorization.

91509649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20220.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 91509649 is about 9566.0675828681. The cubic root of 91509649 is about 450.6322782714.

The spelling of 91509649 in words is "ninety-one million, five hundred nine thousand, six hundred forty-nine".