91668013 has 4 divisors (see below), whose sum is σ = 92068540. Its totient is φ = 91267488.

The previous prime is 91668011. The next prime is 91668037. The reversal of 91668013 is 31086619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52954729 + 38713284 = 7277^2 + 6222^2 .

It is a cyclic number.

It is not a de Polignac number, because 91668013 - 2¹ = 91668011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91668013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91668011) 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 3 ways as a sum of consecutive naturals, for example, 199920 + ... + 200377.

It is an arithmetic number, because the mean of its divisors is an integer number (23017135).

Almost surely, 2^91668013 is an apocalyptic number.

It is an amenable number.

91668013 is a deficient number, since it is larger than the sum of its proper divisors (400527).

91668013 is a wasteful number, since it uses less digits than its factorization.

91668013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400526.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 91668013 is about 9574.3413872705. The cubic root of 91668013 is about 450.8920789359.

The spelling of 91668013 in words is "ninety-one million, six hundred sixty-eight thousand, thirteen".