1561206 has 8 divisors (see below), whose sum is σ = 3122424. Its totient is φ = 520400.

The previous prime is 1561193. The next prime is 1561213. The reversal of 1561206 is 6021651.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1561206 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 130095 + ... + 130106.

It is an arithmetic number, because the mean of its divisors is an integer number (390303).

2^1561206 is an apocalyptic number.

1561206 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561206 is a wasteful number, since it uses less digits than its factorization.

1561206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260206.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1561206 is about 1249.4822927917. The cubic root of 1561206 is about 116.0076788417.

Adding to 1561206 its reverse (6021651), we get a palindrome (7582857).

The spelling of 1561206 in words is "one million, five hundred sixty-one thousand, two hundred six".