1561610159 has 2 divisors, whose sum is σ = 1561610160. Its totient is φ = 1561610158.

The previous prime is 1561610137. The next prime is 1561610189. The reversal of 1561610159 is 9510161651.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561610159 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561610189) 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 as a sum of consecutive naturals, namely, 780805079 + 780805080.

It is an arithmetic number, because the mean of its divisors is an integer number (780805080).

Almost surely, 2^1561610159 is an apocalyptic number.

1561610159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561610159 is an equidigital number, since it uses as much as digits as its factorization.

1561610159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 1561610159 is about 39517.2134518617. The cubic root of 1561610159 is about 1160.1768851840.

The spelling of 1561610159 in words is "one billion, five hundred sixty-one million, six hundred ten thousand, one hundred fifty-nine".