55142783 has 4 divisors (see below), whose sum is σ = 55196400. Its totient is φ = 55089168.

The previous prime is 55142779. The next prime is 55142819. The reversal of 55142783 is 38724155.

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: 38724155 = 5 ⋅7744831.

It is a cyclic number.

It is not a de Polignac number, because 55142783 - 2² = 55142779 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 (55142723) 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, 25235 + ... + 27332.

It is an arithmetic number, because the mean of its divisors is an integer number (13799100).

Almost surely, 2^55142783 is an apocalyptic number.

55142783 is a deficient number, since it is larger than the sum of its proper divisors (53617).

55142783 is a wasteful number, since it uses less digits than its factorization.

55142783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53616.

The product of its digits is 33600, while the sum is 35.

The square root of 55142783 is about 7425.8186754054. The cubic root of 55142783 is about 380.6240507758.

It can be divided in two parts, 551 and 42783, that added together give a palindrome (43334).

The spelling of 55142783 in words is "fifty-five million, one hundred forty-two thousand, seven hundred eighty-three".