158303221 has 2 divisors, whose sum is σ = 158303222. Its totient is φ = 158303220.

The previous prime is 158303219. The next prime is 158303237. The reversal of 158303221 is 122303851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156600196 + 1703025 = 12514^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 158303221 - 2¹ = 158303219 is a prime.

Together with 158303219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158303261) 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, 79151610 + 79151611.

It is an arithmetic number, because the mean of its divisors is an integer number (79151611).

Almost surely, 2^158303221 is an apocalyptic number.

It is an amenable number.

158303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

158303221 is an equidigital number, since it uses as much as digits as its factorization.

158303221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 158303221 is about 12581.8607924265. The cubic root of 158303221 is about 540.9576297361.

The spelling of 158303221 in words is "one hundred fifty-eight million, three hundred three thousand, two hundred twenty-one".