1555801 has 4 divisors (see below), whose sum is σ = 1675492. Its totient is φ = 1436112.

The previous prime is 1555793. The next prime is 1555817. The reversal of 1555801 is 1085551.

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 301401 + 1254400 = 549^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555801 - 2³ = 1555793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1555831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59826 + ... + 59851.

It is an arithmetic number, because the mean of its divisors is an integer number (418873).

2^1555801 is an apocalyptic number.

It is an amenable number.

1555801 is a deficient number, since it is larger than the sum of its proper divisors (119691).

1555801 is a wasteful number, since it uses less digits than its factorization.

1555801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119690.

The product of its (nonzero) digits is 1000, while the sum is 25.

The square root of 1555801 is about 1247.3175217241. The cubic root of 1555801 is about 115.8736485907.

The spelling of 1555801 in words is "one million, five hundred fifty-five thousand, eight hundred one".