91398893 has 4 divisors (see below), whose sum is σ = 91446528. Its totient is φ = 91351260.

The previous prime is 91398883. The next prime is 91398907. The reversal of 91398893 is 39889319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91398893 - 2⁴ = 91398877 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 (91398833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20813 + ... + 24818.

It is an arithmetic number, because the mean of its divisors is an integer number (22861632).

Almost surely, 2^91398893 is an apocalyptic number.

It is an amenable number.

91398893 is a deficient number, since it is larger than the sum of its proper divisors (47635).

91398893 is a wasteful number, since it uses less digits than its factorization.

91398893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47634.

The product of its digits is 419904, while the sum is 50.

The square root of 91398893 is about 9560.2768265359. The cubic root of 91398893 is about 450.4504017207.

It can be divided in two parts, 91 and 398893, that multiplied together give a palindrome (36299263).

The spelling of 91398893 in words is "ninety-one million, three hundred ninety-eight thousand, eight hundred ninety-three".