55540019 has 2 divisors, whose sum is σ = 55540020. Its totient is φ = 55540018.

The previous prime is 55540007. The next prime is 55540027. The reversal of 55540019 is 91004555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55540019 is a prime.

It is a super-2 number, since 2×55540019² = 6169387421040722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55539973 and 55540000.

It is not a weakly prime, because it can be changed into another prime (55540039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27770009 + 27770010.

It is an arithmetic number, because the mean of its divisors is an integer number (27770010).

Almost surely, 2^55540019 is an apocalyptic number.

55540019 is a deficient number, since it is larger than the sum of its proper divisors (1).

55540019 is an equidigital number, since it uses as much as digits as its factorization.

55540019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 55540019 is about 7452.5176282918. The cubic root of 55540019 is about 381.5358410353.

The spelling of 55540019 in words is "fifty-five million, five hundred forty thousand, nineteen".