1200561 has 4 divisors (see below), whose sum is σ = 1600752. Its totient is φ = 800372.

The previous prime is 1200527. The next prime is 1200581. The reversal of 1200561 is 1650021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1650021 = 3 ⋅550007.

It is a cyclic number.

It is not a de Polignac number, because 1200561 - 2¹¹ = 1198513 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1200561.

It is not an unprimeable number, because it can be changed into a prime (1200581) 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, 200091 + ... + 200096.

It is an arithmetic number, because the mean of its divisors is an integer number (400188).

2^1200561 is an apocalyptic number.

It is an amenable number.

1200561 is a deficient number, since it is larger than the sum of its proper divisors (400191).

1200561 is an equidigital number, since it uses as much as digits as its factorization.

1200561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400190.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1200561 is about 1095.7011453859. The cubic root of 1200561 is about 106.2824141011.

Adding to 1200561 its reverse (1650021), we get a palindrome (2850582).

The spelling of 1200561 in words is "one million, two hundred thousand, five hundred sixty-one".