1561301613 has 12 divisors (see below), whose sum is σ = 2297765340. Its totient is φ = 1021228416.

The previous prime is 1561301597. The next prime is 1561301659. The reversal of 1561301613 is 3161031651.

1561301613 is a `hidden beast` number, since 15 + 6 + 1 + 30 + 1 + 613 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1052483364 + 508818249 = 32442^2 + 22557^2 .

It is not a de Polignac number, because 1561301613 - 2⁴ = 1561301597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561301713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1636108 + ... + 1637061.

It is an arithmetic number, because the mean of its divisors is an integer number (191480445).

Almost surely, 2^1561301613 is an apocalyptic number.

It is an amenable number.

1561301613 is a deficient number, since it is larger than the sum of its proper divisors (736463727).

1561301613 is a wasteful number, since it uses less digits than its factorization.

1561301613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273228 (or 3273225 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1561301613 is about 39513.3093147107. The cubic root of 1561301613 is about 1160.1004701424.

The spelling of 1561301613 in words is "one billion, five hundred sixty-one million, three hundred one thousand, six hundred thirteen".