160556581 has 2 divisors, whose sum is σ = 160556582. Its totient is φ = 160556580.

The previous prime is 160556531. The next prime is 160556609. The reversal of 160556581 is 185655061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154008100 + 6548481 = 12410^2 + 2559^2 .

It is a cyclic number.

It is not a de Polignac number, because 160556581 - 2⁹ = 160556069 is a prime.

It is a super-2 number, since 2×160556581² = 51556831404819122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 160556581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (160556531) 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 as a sum of consecutive naturals, namely, 80278290 + 80278291.

It is an arithmetic number, because the mean of its divisors is an integer number (80278291).

Almost surely, 2^160556581 is an apocalyptic number.

It is an amenable number.

160556581 is a deficient number, since it is larger than the sum of its proper divisors (1).

160556581 is an equidigital number, since it uses as much as digits as its factorization.

160556581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 160556581 is about 12671.0923364957. The cubic root of 160556581 is about 543.5122919933.

The spelling of 160556581 in words is "one hundred sixty million, five hundred fifty-six thousand, five hundred eighty-one".