1555552001 has 2 divisors, whose sum is σ = 1555552002. Its totient is φ = 1555552000.

The previous prime is 1555551989. The next prime is 1555552079. The reversal of 1555552001 is 1002555551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428764401 + 126787600 = 37799^2 + 11260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555552001 - 2⁶ = 1555551937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555552081) 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, 777776000 + 777776001.

It is an arithmetic number, because the mean of its divisors is an integer number (777776001).

Almost surely, 2^1555552001 is an apocalyptic number.

It is an amenable number.

1555552001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555552001 is an equidigital number, since it uses as much as digits as its factorization.

1555552001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6250, while the sum is 29.

The square root of 1555552001 is about 39440.4868250888. The cubic root of 1555552001 is about 1158.6746657427.

The spelling of 1555552001 in words is "one billion, five hundred fifty-five million, five hundred fifty-two thousand, one".