55550081 has 2 divisors, whose sum is σ = 55550082. Its totient is φ = 55550080.

The previous prime is 55550059. The next prime is 55550111. The reversal of 55550081 is 18005555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51609856 + 3940225 = 7184^2 + 1985^2 .

It is a cyclic number.

It is not a de Polignac number, because 55550081 - 2⁶ = 55550017 is a prime.

It is a super-2 number, since 2×55550081² = 6171622998213122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55550021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775040 + 27775041.

It is an arithmetic number, because the mean of its divisors is an integer number (27775041).

Almost surely, 2^55550081 is an apocalyptic number.

It is an amenable number.

55550081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55550081 is an equidigital number, since it uses as much as digits as its factorization.

55550081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 55550081 is about 7453.1926716005. The cubic root of 55550081 is about 381.5588801693.

The spelling of 55550081 in words is "fifty-five million, five hundred fifty thousand, eighty-one".