1555200013 has 2 divisors, whose sum is σ = 1555200014. Its totient is φ = 1555200012.

The previous prime is 1555199999. The next prime is 1555200019. The reversal of 1555200013 is 3100025551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1168409124 + 386790889 = 34182^2 + 19667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555200013 - 2⁵ = 1555199981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555200019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777600006 + 777600007.

It is an arithmetic number, because the mean of its divisors is an integer number (777600007).

Almost surely, 2^1555200013 is an apocalyptic number.

It is an amenable number.

1555200013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555200013 is an equidigital number, since it uses as much as digits as its factorization.

1555200013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 1555200013 is about 39436.0243051959. The cubic root of 1555200013 is about 1158.5872647550.

Adding to 1555200013 its reverse (3100025551), we get a palindrome (4655225564).

The spelling of 1555200013 in words is "one billion, five hundred fifty-five million, two hundred thousand, thirteen".