91407863 has 4 divisors (see below), whose sum is σ = 91543560. Its totient is φ = 91272168.

The previous prime is 91407857. The next prime is 91407931. The reversal of 91407863 is 36870419.

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

It is a cyclic number.

It is not a de Polignac number, because 91407863 - 2¹⁰ = 91406839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91400863) 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, 66833 + ... + 68186.

It is an arithmetic number, because the mean of its divisors is an integer number (22885890).

Almost surely, 2^91407863 is an apocalyptic number.

91407863 is a deficient number, since it is larger than the sum of its proper divisors (135697).

91407863 is a wasteful number, since it uses less digits than its factorization.

91407863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135696.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 91407863 is about 9560.7459437013. The cubic root of 91407863 is about 450.4651371578.

The spelling of 91407863 in words is "ninety-one million, four hundred seven thousand, eight hundred sixty-three".