158989217 has 2 divisors, whose sum is σ = 158989218. Its totient is φ = 158989216.

The previous prime is 158989213. The next prime is 158989231. The reversal of 158989217 is 712989851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116985856 + 42003361 = 10816^2 + 6481^2 .

It is a cyclic number.

It is not a de Polignac number, because 158989217 - 2² = 158989213 is a prime.

It is a super-2 number, since 2×158989217² = 50555142244546178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (158989213) 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 as a sum of consecutive naturals, namely, 79494608 + 79494609.

It is an arithmetic number, because the mean of its divisors is an integer number (79494609).

Almost surely, 2^158989217 is an apocalyptic number.

It is an amenable number.

158989217 is a deficient number, since it is larger than the sum of its proper divisors (1).

158989217 is an equidigital number, since it uses as much as digits as its factorization.

158989217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 50.

The square root of 158989217 is about 12609.0926319065. The cubic root of 158989217 is about 541.7379044874.

The spelling of 158989217 in words is "one hundred fifty-eight million, nine hundred eighty-nine thousand, two hundred seventeen".