91380655 has 4 divisors (see below), whose sum is σ = 109656792. Its totient is φ = 73104520.

The previous prime is 91380649. The next prime is 91380701. The reversal of 91380655 is 55608319.

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

It is not a de Polignac number, because 91380655 - 2³ = 91380647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 9138061 + ... + 9138070.

It is an arithmetic number, because the mean of its divisors is an integer number (27414198).

Almost surely, 2^91380655 is an apocalyptic number.

91380655 is a deficient number, since it is larger than the sum of its proper divisors (18276137).

91380655 is a wasteful number, since it uses less digits than its factorization.

91380655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18276136.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 91380655 is about 9559.3229362754. The cubic root of 91380655 is about 450.4204383347.

The spelling of 91380655 in words is "ninety-one million, three hundred eighty thousand, six hundred fifty-five".