55019899 has 4 divisors (see below), whose sum is σ = 60021720. Its totient is φ = 50018080.

The previous prime is 55019897. The next prime is 55019917. The reversal of 55019899 is 99891055.

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 55019899 - 2¹ = 55019897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55019897) 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, 2500894 + ... + 2500915.

It is an arithmetic number, because the mean of its divisors is an integer number (15005430).

Almost surely, 2^55019899 is an apocalyptic number.

55019899 is a deficient number, since it is larger than the sum of its proper divisors (5001821).

55019899 is a wasteful number, since it uses less digits than its factorization.

55019899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5001820.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 55019899 is about 7417.5399560771. The cubic root of 55019899 is about 380.3411041528.

It can be divided in two parts, 5501 and 9899, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 55019899 in words is "fifty-five million, nineteen thousand, eight hundred ninety-nine".