55217519 has 4 divisors (see below), whose sum is σ = 63105744. Its totient is φ = 47329296.

The previous prime is 55217501. The next prime is 55217543. The reversal of 55217519 is 91571255.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91571255 = 5 ⋅18314251.

It is not a de Polignac number, because 55217519 - 2¹² = 55213423 is a prime.

It is a super-2 number, since 2×55217519² = 6097948809030722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55217599) 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, 3944102 + ... + 3944115.

It is an arithmetic number, because the mean of its divisors is an integer number (15776436).

Almost surely, 2^55217519 is an apocalyptic number.

55217519 is a deficient number, since it is larger than the sum of its proper divisors (7888225).

55217519 is an equidigital number, since it uses as much as digits as its factorization.

55217519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7888224.

The product of its digits is 15750, while the sum is 35.

The square root of 55217519 is about 7430.8491439404. The cubic root of 55217519 is about 380.7959286772.

The spelling of 55217519 in words is "fifty-five million, two hundred seventeen thousand, five hundred nineteen".