91408929 has 16 divisors (see below), whose sum is σ = 123125184. Its totient is φ = 60320000.

The previous prime is 91408913. The next prime is 91408931. The reversal of 91408929 is 92980419.

It is a cyclic number.

It is not a de Polignac number, because 91408929 - 2⁴ = 91408913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91408909) 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, 175189 + ... + 175709.

It is an arithmetic number, because the mean of its divisors is an integer number (7695324).

Almost surely, 2^91408929 is an apocalyptic number.

It is an amenable number.

91408929 is a deficient number, since it is larger than the sum of its proper divisors (31716255).

91408929 is a wasteful number, since it uses less digits than its factorization.

91408929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 91408929 is about 9560.8016923269. The cubic root of 91408929 is about 450.4668882616.

The spelling of 91408929 in words is "ninety-one million, four hundred eight thousand, nine hundred twenty-nine".