158638609 has 8 divisors (see below), whose sum is σ = 160654400. Its totient is φ = 156635856.

The previous prime is 158638591. The next prime is 158638631. The reversal of 158638609 is 906836851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158638609 - 2⁹ = 158638097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158638639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22492 + ... + 28690.

It is an arithmetic number, because the mean of its divisors is an integer number (20081800).

Almost surely, 2^158638609 is an apocalyptic number.

It is an amenable number.

158638609 is a deficient number, since it is larger than the sum of its proper divisors (2015791).

158638609 is a wasteful number, since it uses less digits than its factorization.

158638609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6519.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 158638609 is about 12595.1819756604. The cubic root of 158638609 is about 541.3393922760.

The spelling of 158638609 in words is "one hundred fifty-eight million, six hundred thirty-eight thousand, six hundred nine".