1613305561 has 32 divisors (see below), whose sum is σ = 2008661760. Its totient is φ = 1264813056.

The previous prime is 1613305553. The next prime is 1613305579. The reversal of 1613305561 is 1655033161.

It is a cyclic number.

It is not a de Polignac number, because 1613305561 - 2³ = 1613305553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1613305591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 672981 + ... + 675373.

It is an arithmetic number, because the mean of its divisors is an integer number (62770680).

Almost surely, 2^1613305561 is an apocalyptic number.

It is an amenable number.

1613305561 is a deficient number, since it is larger than the sum of its proper divisors (395356199).

1613305561 is a wasteful number, since it uses less digits than its factorization.

1613305561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 1613305561 is about 40165.9751655552. The cubic root of 1613305561 is about 1172.8402907526.

The spelling of 1613305561 in words is "one billion, six hundred thirteen million, three hundred five thousand, five hundred sixty-one".