1201566 has 16 divisors (see below), whose sum is σ = 2507904. Its totient is φ = 383064.

The previous prime is 1201559. The next prime is 1201567. The reversal of 1201566 is 6651021.

It is a happy number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201567) 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 7 ways as a sum of consecutive naturals, for example, 4216 + ... + 4491.

It is an arithmetic number, because the mean of its divisors is an integer number (156744).

2^1201566 is an apocalyptic number.

1201566 is an abundant number, since it is smaller than the sum of its proper divisors (1306338).

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

1201566 is a wasteful number, since it uses less digits than its factorization.

1201566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8735.

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

The square root of 1201566 is about 1096.1596599036. The cubic root of 1201566 is about 106.3120624724.

Adding to 1201566 its reverse (6651021), we get a palindrome (7852587).

The spelling of 1201566 in words is "one million, two hundred one thousand, five hundred sixty-six".