158107561 has 4 divisors (see below), whose sum is σ = 160273492. Its totient is φ = 155941632.

The previous prime is 158107553. The next prime is 158107571. The reversal of 158107561 is 165701851.

158107561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102515625 + 55591936 = 10125^2 + 7456^2 .

It is a cyclic number.

It is not a de Polignac number, because 158107561 - 2³ = 158107553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158107501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082856 + ... + 1083001.

It is an arithmetic number, because the mean of its divisors is an integer number (40068373).

Almost surely, 2^158107561 is an apocalyptic number.

It is an amenable number.

158107561 is a deficient number, since it is larger than the sum of its proper divisors (2165931).

158107561 is an equidigital number, since it uses as much as digits as its factorization.

158107561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165930.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 158107561 is about 12574.0829089043. The cubic root of 158107561 is about 540.7346664758.

The spelling of 158107561 in words is "one hundred fifty-eight million, one hundred seven thousand, five hundred sixty-one".