158334721 has 2 divisors, whose sum is σ = 158334722. Its totient is φ = 158334720.

The previous prime is 158334707. The next prime is 158334727. The reversal of 158334721 is 127433851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123654400 + 34680321 = 11120^2 + 5889^2 .

It is an emirp because it is prime and its reverse (127433851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158334721 - 2⁵ = 158334689 is a prime.

It is not a weakly prime, because it can be changed into another prime (158334727) 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, 79167360 + 79167361.

It is an arithmetic number, because the mean of its divisors is an integer number (79167361).

Almost surely, 2^158334721 is an apocalyptic number.

It is an amenable number.

158334721 is a deficient number, since it is larger than the sum of its proper divisors (1).

158334721 is an equidigital number, since it uses as much as digits as its factorization.

158334721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 158334721 is about 12583.1125322791. The cubic root of 158334721 is about 540.9935082127.

The spelling of 158334721 in words is "one hundred fifty-eight million, three hundred thirty-four thousand, seven hundred twenty-one".