1561201206 has 8 divisors (see below), whose sum is σ = 3122402424. Its totient is φ = 520400400.

The previous prime is 1561201189. The next prime is 1561201207. The reversal of 1561201206 is 6021021651.

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

1561201206 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561201207) 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, 130100095 + ... + 130100106.

It is an arithmetic number, because the mean of its divisors is an integer number (390300303).

Almost surely, 2^1561201206 is an apocalyptic number.

1561201206 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.

1561201206 is a wasteful number, since it uses less digits than its factorization.

1561201206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260200206.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1561201206 is about 39512.0387477032. The cubic root of 1561201206 is about 1160.0756009982.

Adding to 1561201206 its reverse (6021021651), we get a palindrome (7582222857).

The spelling of 1561201206 in words is "one billion, five hundred sixty-one million, two hundred one thousand, two hundred six".