158281561 has 9 divisors (see below), whose sum is σ = 165765621. Its totient is φ = 151122972.

The previous prime is 158281559. The next prime is 158281579. The reversal of 158281561 is 165182851.

The square root of 158281561 is 12581.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 158281561 - 2¹ = 158281559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158281561.

It is not an unprimeable number, because it can be changed into a prime (158281531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 289090 + ... + 289636.

Almost surely, 2^158281561 is an apocalyptic number.

158281561 is the 12581-st square number.

158281561 is the 6291-st centered octagonal number.

It is an amenable number.

158281561 is a deficient number, since it is larger than the sum of its proper divisors (7484060).

158281561 is an frugal number, since it uses more digits than its factorization.

158281561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140 (or 570 counting only the distinct ones).

The product of its digits is 19200, while the sum is 37.

The cubic root of 158281561 is about 540.9329562506.

The spelling of 158281561 in words is "one hundred fifty-eight million, two hundred eighty-one thousand, five hundred sixty-one".