91409665 has 16 divisors (see below), whose sum is σ = 115776000. Its totient is φ = 69092352.

The previous prime is 91409579. The next prime is 91409671. The reversal of 91409665 is 56690419.

It is a cyclic number.

It is not a de Polignac number, because 91409665 - 2²¹ = 89312513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41584 + ... + 43726.

It is an arithmetic number, because the mean of its divisors is an integer number (7236000).

Almost surely, 2^91409665 is an apocalyptic number.

91409665 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

91409665 is a deficient number, since it is larger than the sum of its proper divisors (24366335).

91409665 is a wasteful number, since it uses less digits than its factorization.

91409665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616.

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

The square root of 91409665 is about 9560.8401827454. The cubic root of 91409665 is about 450.4680972710.

The spelling of 91409665 in words is "ninety-one million, four hundred nine thousand, six hundred sixty-five".