55250509 has 4 divisors (see below), whose sum is σ = 56743804. Its totient is φ = 53757216.

The previous prime is 55250497. The next prime is 55250513. The reversal of 55250509 is 90505255.

55250509 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: 90505255 = 5 ⋅18101051.

It can be written as a sum of positive squares in 2 ways, for example, as 41964484 + 13286025 = 6478^2 + 3645^2 .

It is a cyclic number.

It is not a de Polignac number, because 55250509 - 2²³ = 46861901 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 (55250519) 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, 746592 + ... + 746665.

It is an arithmetic number, because the mean of its divisors is an integer number (14185951).

Almost surely, 2^55250509 is an apocalyptic number.

It is an amenable number.

55250509 is a deficient number, since it is larger than the sum of its proper divisors (1493295).

55250509 is a wasteful number, since it uses less digits than its factorization.

55250509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493294.

The product of its (nonzero) digits is 11250, while the sum is 31.

The square root of 55250509 is about 7433.0686126256. The cubic root of 55250509 is about 380.8717497627.

The spelling of 55250509 in words is "fifty-five million, two hundred fifty thousand, five hundred nine".