55555001 has 2 divisors, whose sum is σ = 55555002. Its totient is φ = 55555000.

The previous prime is 55554953. The next prime is 55555009. The reversal of 55555001 is 10055555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53071225 + 2483776 = 7285^2 + 1576^2 .

It is a cyclic number.

It is not a de Polignac number, because 55555001 - 2¹⁴ = 55538617 is a prime.

It is a super-2 number, since 2×55555001² = 6172716272220002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55555009) 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 as a sum of consecutive naturals, namely, 27777500 + 27777501.

It is an arithmetic number, because the mean of its divisors is an integer number (27777501).

Almost surely, 2^55555001 is an apocalyptic number.

It is an amenable number.

55555001 is a deficient number, since it is larger than the sum of its proper divisors (1).

55555001 is an equidigital number, since it uses as much as digits as its factorization.

55555001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3125, while the sum is 26.

The square root of 55555001 is about 7453.5227241889. The cubic root of 55555001 is about 381.5701445649.

The spelling of 55555001 in words is "fifty-five million, five hundred fifty-five thousand, one".