1611561701 has 2 divisors, whose sum is σ = 1611561702. Its totient is φ = 1611561700.

The previous prime is 1611561659. The next prime is 1611561713. The reversal of 1611561701 is 1071651161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874384900 + 737176801 = 29570^2 + 27151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611561701 - 2¹⁴ = 1611545317 is a prime.

It is a super-2 number, since 2×1611561701² = 5194262232260026802, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1611561761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805780850 + 805780851.

It is an arithmetic number, because the mean of its divisors is an integer number (805780851).

Almost surely, 2^1611561701 is an apocalyptic number.

It is an amenable number.

1611561701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611561701 is an equidigital number, since it uses as much as digits as its factorization.

1611561701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 29.

The square root of 1611561701 is about 40144.2611216099. The cubic root of 1611561701 is about 1172.4175548311.

The spelling of 1611561701 in words is "one billion, six hundred eleven million, five hundred sixty-one thousand, seven hundred one".