55142509 has 4 divisors (see below), whose sum is σ = 58386204. Its totient is φ = 51898816.

The previous prime is 55142497. The next prime is 55142519. The reversal of 55142509 is 90524155.

55142509 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.

It can be written as a sum of positive squares in 2 ways, for example, as 34257609 + 20884900 = 5853^2 + 4570^2 .

It is a cyclic number.

It is not a de Polignac number, because 55142509 - 2¹¹ = 55140461 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 (55142519) 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, 1621822 + ... + 1621855.

It is an arithmetic number, because the mean of its divisors is an integer number (14596551).

Almost surely, 2^55142509 is an apocalyptic number.

It is an amenable number.

55142509 is a deficient number, since it is larger than the sum of its proper divisors (3243695).

55142509 is a wasteful number, since it uses less digits than its factorization.

55142509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243694.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 55142509 is about 7425.8002262382. The cubic root of 55142509 is about 380.6234203448.

The spelling of 55142509 in words is "fifty-five million, one hundred forty-two thousand, five hundred nine".