1555201 has 4 divisors (see below), whose sum is σ = 1571332. Its totient is φ = 1539072.

The previous prime is 1555199. The next prime is 1555223. The reversal of 1555201 is 1025551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 230400 + 1324801 = 480^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555201 - 2¹ = 1555199 is a prime.

It is an Ulam number.

It is a Duffinian number.

1555201 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7920 + ... + 8113.

It is an arithmetic number, because the mean of its divisors is an integer number (392833).

2^1555201 is an apocalyptic number.

It is an amenable number.

1555201 is a deficient number, since it is larger than the sum of its proper divisors (16131).

1555201 is an equidigital number, since it uses as much as digits as its factorization.

1555201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16130.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 1555201 is about 1247.0769823872. The cubic root of 1555201 is about 115.8587509852.

It can be divided in two parts, 155 and 5201, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 1555201 in words is "one million, five hundred fifty-five thousand, two hundred one".