158416561 has 2 divisors, whose sum is σ = 158416562. Its totient is φ = 158416560.

The previous prime is 158416513. The next prime is 158416607. The reversal of 158416561 is 165614851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143640225 + 14776336 = 11985^2 + 3844^2 .

It is a cyclic number.

It is not a de Polignac number, because 158416561 - 2¹⁷ = 158285489 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 158416561.

It is not a weakly prime, because it can be changed into another prime (158416501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79208280 + 79208281.

It is an arithmetic number, because the mean of its divisors is an integer number (79208281).

Almost surely, 2^158416561 is an apocalyptic number.

It is an amenable number.

158416561 is a deficient number, since it is larger than the sum of its proper divisors (1).

158416561 is an equidigital number, since it uses as much as digits as its factorization.

158416561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The square root of 158416561 is about 12586.3640897600. The cubic root of 158416561 is about 541.0867016752.

It can be divided in two parts, 1584 and 16561, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 158416561 in words is "one hundred fifty-eight million, four hundred sixteen thousand, five hundred sixty-one".