158181009 has 16 divisors (see below), whose sum is σ = 241548288. Its totient is φ = 90197712.

The previous prime is 158181007. The next prime is 158181011. The reversal of 158181009 is 900181851.

158181009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (158181007) and next prime (158181011).

It is not a de Polignac number, because 158181009 - 2¹ = 158181007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (158181007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2494 + ... + 17960.

It is an arithmetic number, because the mean of its divisors is an integer number (15096768).

Almost surely, 2^158181009 is an apocalyptic number.

It is an amenable number.

158181009 is a deficient number, since it is larger than the sum of its proper divisors (83367279).

158181009 is a wasteful number, since it uses less digits than its factorization.

158181009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15964.

The product of its (nonzero) digits is 2880, while the sum is 33.

The square root of 158181009 is about 12577.0031804083. The cubic root of 158181009 is about 540.8183852876.

The spelling of 158181009 in words is "one hundred fifty-eight million, one hundred eighty-one thousand, nine".