91329609 has 16 divisors (see below), whose sum is σ = 140933120. Its totient is φ = 51526800.

The previous prime is 91329607. The next prime is 91329629. The reversal of 91329609 is 90692319.

It is a happy number.

It is not a de Polignac number, because 91329609 - 2¹ = 91329607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91329607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25867 + ... + 29184.

It is an arithmetic number, because the mean of its divisors is an integer number (8808320).

Almost surely, 2^91329609 is an apocalyptic number.

It is an amenable number.

91329609 is a deficient number, since it is larger than the sum of its proper divisors (49603511).

91329609 is a wasteful number, since it uses less digits than its factorization.

91329609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55140.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 91329609 is about 9556.6526043380. The cubic root of 91329609 is about 450.3365531688.

The spelling of 91329609 in words is "ninety-one million, three hundred twenty-nine thousand, six hundred nine".