91668137 has 16 divisors (see below), whose sum is σ = 101606400. Its totient is φ = 82010640.

The previous prime is 91668113. The next prime is 91668151. The reversal of 91668137 is 73186619.

It is a cyclic number.

It is not a de Polignac number, because 91668137 - 2⁸ = 91667881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91668094 and 91668103.

It is not an unprimeable number, because it can be changed into a prime (91668197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255164 + ... + 255522.

It is an arithmetic number, because the mean of its divisors is an integer number (6350400).

Almost surely, 2^91668137 is an apocalyptic number.

It is an amenable number.

91668137 is a deficient number, since it is larger than the sum of its proper divisors (9938263).

91668137 is a wasteful number, since it uses less digits than its factorization.

91668137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676.

The product of its digits is 54432, while the sum is 41.

The square root of 91668137 is about 9574.3478629095. The cubic root of 91668137 is about 450.8922822442.

The spelling of 91668137 in words is "ninety-one million, six hundred sixty-eight thousand, one hundred thirty-seven".