1561151206 has 16 divisors (see below), whose sum is σ = 2402763264. Its totient is φ = 760329864.

The previous prime is 1561151177. The next prime is 1561151213. The reversal of 1561151206 is 6021511651.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6831 + ... + 56293.

It is an arithmetic number, because the mean of its divisors is an integer number (150172704).

Almost surely, 2^1561151206 is an apocalyptic number.

1561151206 is a deficient number, since it is larger than the sum of its proper divisors (841612058).

1561151206 is a wasteful number, since it uses less digits than its factorization.

1561151206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49875.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1561151206 is about 39511.4060240837. The cubic root of 1561151206 is about 1160.0632164320.

Adding to 1561151206 its reverse (6021511651), we get a palindrome (7582662857).

The spelling of 1561151206 in words is "one billion, five hundred sixty-one million, one hundred fifty-one thousand, two hundred six".