1565567161 has 2 divisors, whose sum is σ = 1565567162. Its totient is φ = 1565567160.

The previous prime is 1565567131. The next prime is 1565567173. The reversal of 1565567161 is 1617655651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1556775936 + 8791225 = 39456^2 + 2965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1565567161 - 2⁷ = 1565567033 is a prime.

It is a super-3 number, since 3×1565567161³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1565567131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782783580 + 782783581.

It is an arithmetic number, because the mean of its divisors is an integer number (782783581).

Almost surely, 2^1565567161 is an apocalyptic number.

It is an amenable number.

1565567161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1565567161 is an equidigital number, since it uses as much as digits as its factorization.

1565567161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 43.

The square root of 1565567161 is about 39567.2485902166. The cubic root of 1565567161 is about 1161.1559921396.

The spelling of 1565567161 in words is "one billion, five hundred sixty-five million, five hundred sixty-seven thousand, one hundred sixty-one".