158471009 has 2 divisors, whose sum is σ = 158471010. Its totient is φ = 158471008.

The previous prime is 158470979. The next prime is 158471011. The reversal of 158471009 is 900174851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157753600 + 717409 = 12560^2 + 847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158471009 is a prime.

It is a super-2 number, since 2×158471009² = 50226121386956162, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 158471011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 158471009.

It is not a weakly prime, because it can be changed into another prime (158471809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79235504 + 79235505.

It is an arithmetic number, because the mean of its divisors is an integer number (79235505).

Almost surely, 2^158471009 is an apocalyptic number.

It is an amenable number.

158471009 is a deficient number, since it is larger than the sum of its proper divisors (1).

158471009 is an equidigital number, since it uses as much as digits as its factorization.

158471009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 158471009 is about 12588.5268796631. The cubic root of 158471009 is about 541.1486853338.

The spelling of 158471009 in words is "one hundred fifty-eight million, four hundred seventy-one thousand, nine".