55172015 has 4 divisors (see below), whose sum is σ = 66206424. Its totient is φ = 44137608.

The previous prime is 55172003. The next prime is 55172027. The reversal of 55172015 is 51027155.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55172003) and next prime (55172027).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55172015 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 5517197 + ... + 5517206.

It is an arithmetic number, because the mean of its divisors is an integer number (16551606).

Almost surely, 2^55172015 is an apocalyptic number.

55172015 is a deficient number, since it is larger than the sum of its proper divisors (11034409).

55172015 is a wasteful number, since it uses less digits than its factorization.

55172015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11034408.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 55172015 is about 7427.7866824512. The cubic root of 55172015 is about 380.6912970296.

The spelling of 55172015 in words is "fifty-five million, one hundred seventy-two thousand, fifteen".