55120019 has 4 divisors (see below), whose sum is σ = 55136544. Its totient is φ = 55103496.

The previous prime is 55120003. The next prime is 55120061. The reversal of 55120019 is 91002155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91002155 = 5 ⋅18200431.

It is a cyclic number.

It is not a de Polignac number, because 55120019 - 2⁴ = 55120003 is a prime.

It is a super-2 number, since 2×55120019² = 6076432989120722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55119976 and 55120003.

It is not an unprimeable number, because it can be changed into a prime (55120099) 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, 1307 + ... + 10580.

It is an arithmetic number, because the mean of its divisors is an integer number (13784136).

Almost surely, 2^55120019 is an apocalyptic number.

55120019 is a deficient number, since it is larger than the sum of its proper divisors (16525).

55120019 is a wasteful number, since it uses less digits than its factorization.

55120019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16524.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 55120019 is about 7424.2857568927. The cubic root of 55120019 is about 380.5716672605.

The spelling of 55120019 in words is "fifty-five million, one hundred twenty thousand, nineteen".