91018055 has 4 divisors (see below), whose sum is σ = 109221672. Its totient is φ = 72814440.

The previous prime is 91018043. The next prime is 91018063. The reversal of 91018055 is 55081019.

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

It is not a de Polignac number, because 91018055 - 2¹⁴ = 91001671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9101801 + ... + 9101810.

It is an arithmetic number, because the mean of its divisors is an integer number (27305418).

Almost surely, 2^91018055 is an apocalyptic number.

91018055 is a deficient number, since it is larger than the sum of its proper divisors (18203617).

91018055 is a wasteful number, since it uses less digits than its factorization.

91018055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18203616.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 91018055 is about 9540.3383063705. The cubic root of 91018055 is about 449.8238899350.

The spelling of 91018055 in words is "ninety-one million, eighteen thousand, fifty-five".