1555986853 has 2 divisors, whose sum is σ = 1555986854. Its totient is φ = 1555986852.

The previous prime is 1555986833. The next prime is 1555986917. The reversal of 1555986853 is 3586895551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1265011489 + 290975364 = 35567^2 + 17058^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555986853 - 2²⁵ = 1522432421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1555986794 and 1555986803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555986833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777993426 + 777993427.

It is an arithmetic number, because the mean of its divisors is an integer number (777993427).

Almost surely, 2^1555986853 is an apocalyptic number.

It is an amenable number.

1555986853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555986853 is an equidigital number, since it uses as much as digits as its factorization.

1555986853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480000, while the sum is 55.

The square root of 1555986853 is about 39445.9992014399. Note that the first 3 decimals coincide. The cubic root of 1555986853 is about 1158.7826242150.

The spelling of 1555986853 in words is "one billion, five hundred fifty-five million, nine hundred eighty-six thousand, eight hundred fifty-three".