91968407 has 4 divisors (see below), whose sum is σ = 91993536. Its totient is φ = 91943280.

The previous prime is 91968389. The next prime is 91968449. The reversal of 91968407 is 70486919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70486919 = 487 ⋅144737.

It is a cyclic number.

It is not a de Polignac number, because 91968407 - 2⁶ = 91968343 is a prime.

It is a super-3 number, since 3×91968407³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91968307) 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, 5894 + ... + 14787.

It is an arithmetic number, because the mean of its divisors is an integer number (22998384).

Almost surely, 2^91968407 is an apocalyptic number.

91968407 is a deficient number, since it is larger than the sum of its proper divisors (25129).

91968407 is a wasteful number, since it uses less digits than its factorization.

91968407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25128.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 91968407 is about 9590.0160062432. The cubic root of 91968407 is about 451.3840629593.

The spelling of 91968407 in words is "ninety-one million, nine hundred sixty-eight thousand, four hundred seven".