55302815 has 4 divisors (see below), whose sum is σ = 66363384. Its totient is φ = 44242248.

The previous prime is 55302811. The next prime is 55302839. The reversal of 55302815 is 51820355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51820355 = 5 ⋅10364071.

It is a cyclic number.

It is not a de Polignac number, because 55302815 - 2² = 55302811 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 (55302811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5530277 + ... + 5530286.

It is an arithmetic number, because the mean of its divisors is an integer number (16590846).

Almost surely, 2^55302815 is an apocalyptic number.

55302815 is a deficient number, since it is larger than the sum of its proper divisors (11060569).

55302815 is a wasteful number, since it uses less digits than its factorization.

55302815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11060568.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 55302815 is about 7436.5862463902. The cubic root of 55302815 is about 380.9919030710.

The spelling of 55302815 in words is "fifty-five million, three hundred two thousand, eight hundred fifteen".