91424993 has 8 divisors (see below), whose sum is σ = 100136736. Its totient is φ = 82780000.

The previous prime is 91424987. The next prime is 91424999. The reversal of 91424993 is 39942419.

It is an interprime number because it is at equal distance from previous prime (91424987) and next prime (91424999).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91424993 - 2¹⁸ = 91162849 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 91424993.

It is not an unprimeable number, because it can be changed into a prime (91424999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13796 + ... + 19317.

It is an arithmetic number, because the mean of its divisors is an integer number (12517092).

Almost surely, 2^91424993 is an apocalyptic number.

It is an amenable number.

91424993 is a deficient number, since it is larger than the sum of its proper divisors (8711743).

91424993 is a wasteful number, since it uses less digits than its factorization.

91424993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33375.

The product of its digits is 69984, while the sum is 41.

The square root of 91424993 is about 9561.6417523352. The cubic root of 91424993 is about 450.4932747293.

The spelling of 91424993 in words is "ninety-one million, four hundred twenty-four thousand, nine hundred ninety-three".