1555249 has 2 divisors, whose sum is σ = 1555250. Its totient is φ = 1555248.

The previous prime is 1555247. The next prime is 1555259. The reversal of 1555249 is 9425551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 431649 = 1060^2 + 657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555249 - 2¹ = 1555247 is a prime.

Together with 1555247, it forms a pair of twin primes.

It is a Chen prime.

1555249 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1555249.

It is not a weakly prime, because it can be changed into another prime (1555243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777624 + 777625.

It is an arithmetic number, because the mean of its divisors is an integer number (777625).

2^1555249 is an apocalyptic number.

It is an amenable number.

1555249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555249 is an equidigital number, since it uses as much as digits as its factorization.

1555249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 1555249 is about 1247.0962272415. The cubic root of 1555249 is about 115.8599429346.

The spelling of 1555249 in words is "one million, five hundred fifty-five thousand, two hundred forty-nine".