91290055 has 8 divisors (see below), whose sum is σ = 109741392. Its totient is φ = 72903168.

The previous prime is 91290047. The next prime is 91290091. The reversal of 91290055 is 55009219.

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 91290055 - 2³ = 91290047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91289999 and 91290026.

It is a congruent 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, 12937 + ... + 18706.

It is an arithmetic number, because the mean of its divisors is an integer number (13717674).

Almost surely, 2^91290055 is an apocalyptic number.

91290055 is a deficient number, since it is larger than the sum of its proper divisors (18451337).

91290055 is a wasteful number, since it uses less digits than its factorization.

91290055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32225.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 91290055 is about 9554.5829317663. The cubic root of 91290055 is about 450.2715315972.

The spelling of 91290055 in words is "ninety-one million, two hundred ninety thousand, fifty-five".