91830055 has 4 divisors (see below), whose sum is σ = 110196072. Its totient is φ = 73464040.

The previous prime is 91830023. The next prime is 91830103. The reversal of 91830055 is 55003819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55003819 = 13 ⋅4231063.

It is not a de Polignac number, because 91830055 - 2⁵ = 91830023 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91829999 and 91830026.

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, 9183001 + ... + 9183010.

It is an arithmetic number, because the mean of its divisors is an integer number (27549018).

Almost surely, 2^91830055 is an apocalyptic number.

91830055 is a deficient number, since it is larger than the sum of its proper divisors (18366017).

91830055 is a wasteful number, since it uses less digits than its factorization.

91830055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366016.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 91830055 is about 9582.7999561715. The cubic root of 91830055 is about 451.1576039268.

The spelling of 91830055 in words is "ninety-one million, eight hundred thirty thousand, fifty-five".