158420609 has 2 divisors, whose sum is σ = 158420610. Its totient is φ = 158420608.

The previous prime is 158420579. The next prime is 158420611. The reversal of 158420609 is 906024851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90193009 + 68227600 = 9497^2 + 8260^2 .

It is a cyclic number.

It is not a de Polignac number, because 158420609 - 2¹² = 158416513 is a prime.

Together with 158420611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (158120609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79210304 + 79210305.

It is an arithmetic number, because the mean of its divisors is an integer number (79210305).

Almost surely, 2^158420609 is an apocalyptic number.

It is an amenable number.

158420609 is a deficient number, since it is larger than the sum of its proper divisors (1).

158420609 is an equidigital number, since it uses as much as digits as its factorization.

158420609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 158420609 is about 12586.5248976832. The cubic root of 158420609 is about 541.0913104111.

The spelling of 158420609 in words is "one hundred fifty-eight million, four hundred twenty thousand, six hundred nine".