91385555 has 8 divisors (see below), whose sum is σ = 114430752. Its totient is φ = 69929728.

The previous prime is 91385533. The next prime is 91385563. The reversal of 91385555 is 55558319.

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 91385555 - 2⁸ = 91385299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397214 + ... + 397443.

It is an arithmetic number, because the mean of its divisors is an integer number (14303844).

Almost surely, 2^91385555 is an apocalyptic number.

91385555 is a deficient number, since it is larger than the sum of its proper divisors (23045197).

91385555 is a wasteful number, since it uses less digits than its factorization.

91385555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794685.

The product of its digits is 135000, while the sum is 41.

The square root of 91385555 is about 9559.5792271417. The cubic root of 91385555 is about 450.4284889836.

It can be divided in two parts, 913 and 85555, that added together give a palindrome (86468).

The spelling of 91385555 in words is "ninety-one million, three hundred eighty-five thousand, five hundred fifty-five".