55145919 has 4 divisors (see below), whose sum is σ = 73527896. Its totient is φ = 36763944.

The previous prime is 55145911. The next prime is 55145933. The reversal of 55145919 is 91954155.

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

It is not a de Polignac number, because 55145919 - 2³ = 55145911 is a prime.

It is a super-2 number, since 2×55145919² = 6082144764709122, 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 (55145911) 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, 9190984 + ... + 9190989.

It is an arithmetic number, because the mean of its divisors is an integer number (18381974).

Almost surely, 2^55145919 is an apocalyptic number.

55145919 is a deficient number, since it is larger than the sum of its proper divisors (18381977).

55145919 is a wasteful number, since it uses less digits than its factorization.

55145919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18381976.

The product of its digits is 40500, while the sum is 39.

The square root of 55145919 is about 7426.0298275727. The cubic root of 55145919 is about 380.6312660712.

The spelling of 55145919 in words is "fifty-five million, one hundred forty-five thousand, nine hundred nineteen".