55642111 has 4 divisors (see below), whose sum is σ = 63590992. Its totient is φ = 47693232.

The previous prime is 55642109. The next prime is 55642159. The reversal of 55642111 is 11124655.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11124655 = 5 ⋅2224931.

It is a cyclic number.

It is not a de Polignac number, because 55642111 - 2¹ = 55642109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55642511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3974430 + ... + 3974443.

It is an arithmetic number, because the mean of its divisors is an integer number (15897748).

Almost surely, 2^55642111 is an apocalyptic number.

55642111 is a deficient number, since it is larger than the sum of its proper divisors (7948881).

55642111 is an equidigital number, since it uses as much as digits as its factorization.

55642111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948880.

The product of its digits is 1200, while the sum is 25.

The square root of 55642111 is about 7459.3639809303. The cubic root of 55642111 is about 381.7694738612.

Adding to 55642111 its reverse (11124655), we get a palindrome (66766766).

The spelling of 55642111 in words is "fifty-five million, six hundred forty-two thousand, one hundred eleven".