1611561713 has 2 divisors, whose sum is σ = 1611561714. Its totient is φ = 1611561712.

The previous prime is 1611561701. The next prime is 1611561719. The reversal of 1611561713 is 3171651161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1339047649 + 272514064 = 36593^2 + 16508^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611561713 - 2¹⁴ = 1611545329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1611561713.

It is not a weakly prime, because it can be changed into another prime (1611561719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805780856 + 805780857.

It is an arithmetic number, because the mean of its divisors is an integer number (805780857).

Almost surely, 2^1611561713 is an apocalyptic number.

It is an amenable number.

1611561713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611561713 is an equidigital number, since it uses as much as digits as its factorization.

1611561713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 32.

The square root of 1611561713 is about 40144.2612710709. The cubic root of 1611561713 is about 1172.4175577411.

The spelling of 1611561713 in words is "one billion, six hundred eleven million, five hundred sixty-one thousand, seven hundred thirteen".