1561067361 has 24 divisors (see below), whose sum is σ = 2665865280. Its totient is φ = 861277536.

The previous prime is 1561067359. The next prime is 1561067377. The reversal of 1561067361 is 1637601651.

1561067361 is a `hidden beast` number, since 1 + 5 + 610 + 6 + 7 + 36 + 1 = 666.

It is not a de Polignac number, because 1561067361 - 2¹ = 1561067359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561067351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 425395 + ... + 429048.

It is an arithmetic number, because the mean of its divisors is an integer number (111077720).

Almost surely, 2^1561067361 is an apocalyptic number.

It is an amenable number.

1561067361 is a deficient number, since it is larger than the sum of its proper divisors (1104797919).

1561067361 is a wasteful number, since it uses less digits than its factorization.

1561067361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854485 (or 854482 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 1561067361 is about 39510.3449871043. The cubic root of 1561067361 is about 1160.0424481593.

The spelling of 1561067361 in words is "one billion, five hundred sixty-one million, sixty-seven thousand, three hundred sixty-one".