55451819 has 2 divisors, whose sum is σ = 55451820. Its totient is φ = 55451818.

The previous prime is 55451797. The next prime is 55451843. The reversal of 55451819 is 91815455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55451819 - 2¹² = 55447723 is a prime.

It is a super-2 number, since 2×55451819² = 6149808460817522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55459819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27725909 + 27725910.

It is an arithmetic number, because the mean of its divisors is an integer number (27725910).

Almost surely, 2^55451819 is an apocalyptic number.

55451819 is a deficient number, since it is larger than the sum of its proper divisors (1).

55451819 is an equidigital number, since it uses as much as digits as its factorization.

55451819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 38.

The square root of 55451819 is about 7446.5978137670. The cubic root of 55451819 is about 381.3337687827. Note that the first 3 decimals are identical.

The spelling of 55451819 in words is "fifty-five million, four hundred fifty-one thousand, eight hundred nineteen".