158297989 has 4 divisors (see below), whose sum is σ = 160893100. Its totient is φ = 155702880.

The previous prime is 158297969. The next prime is 158298053. The reversal of 158297989 is 989792851.

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 24502500 + 133795489 = 4950^2 + 11567^2 .

It is a cyclic number.

It is not a de Polignac number, because 158297989 - 2⁵ = 158297957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158297929) 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 3 ways as a sum of consecutive naturals, for example, 1297464 + ... + 1297585.

It is an arithmetic number, because the mean of its divisors is an integer number (40223275).

Almost surely, 2^158297989 is an apocalyptic number.

It is an amenable number.

158297989 is a deficient number, since it is larger than the sum of its proper divisors (2595111).

158297989 is an equidigital number, since it uses as much as digits as its factorization.

158297989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595110.

The product of its digits is 3265920, while the sum is 58.

The square root of 158297989 is about 12581.6528723376. The cubic root of 158297989 is about 540.9516700311.

The spelling of 158297989 in words is "one hundred fifty-eight million, two hundred ninety-seven thousand, nine hundred eighty-nine".