55231091 has 4 divisors (see below), whose sum is σ = 55313832. Its totient is φ = 55148352.

The previous prime is 55231087. The next prime is 55231093. The reversal of 55231091 is 19013255.

55231091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19013255 = 5 ⋅3802651.

It is a cyclic number.

It is not a de Polignac number, because 55231091 - 2² = 55231087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55231091.

It is not an unprimeable number, because it can be changed into a prime (55231093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40361 + ... + 41706.

It is an arithmetic number, because the mean of its divisors is an integer number (13828458).

Almost surely, 2^55231091 is an apocalyptic number.

55231091 is a deficient number, since it is larger than the sum of its proper divisors (82741).

55231091 is an equidigital number, since it uses as much as digits as its factorization.

55231091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82740.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 55231091 is about 7431.7623078244. The cubic root of 55231091 is about 380.8271249296.

The spelling of 55231091 in words is "fifty-five million, two hundred thirty-one thousand, ninety-one".