55249139 has 4 divisors (see below), whose sum is σ = 60271800. Its totient is φ = 50226480.

The previous prime is 55249123. The next prime is 55249171. The reversal of 55249139 is 93194255.

55249139 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 is a cyclic number.

It is not a de Polignac number, because 55249139 - 2⁴ = 55249123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55249189) 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, 2511314 + ... + 2511335.

It is an arithmetic number, because the mean of its divisors is an integer number (15067950).

Almost surely, 2^55249139 is an apocalyptic number.

55249139 is a deficient number, since it is larger than the sum of its proper divisors (5022661).

55249139 is a wasteful number, since it uses less digits than its factorization.

55249139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5022660.

The product of its digits is 48600, while the sum is 38.

The square root of 55249139 is about 7432.9764563060. The cubic root of 55249139 is about 380.8686016854.

Subtracting 55249139 from its reverse (93194255), we obtain a triangular number (37945116 = T₈₇₁₁).

The spelling of 55249139 in words is "fifty-five million, two hundred forty-nine thousand, one hundred thirty-nine".