167478221 has 2 divisors, whose sum is σ = 167478222. Its totient is φ = 167478220.

The previous prime is 167478193. The next prime is 167478229. The reversal of 167478221 is 122874761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86676100 + 80802121 = 9310^2 + 8989^2 .

It is an emirp because it is prime and its reverse (122874761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-167478221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167478229) 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, 83739110 + 83739111.

It is an arithmetic number, because the mean of its divisors is an integer number (83739111).

Almost surely, 2^167478221 is an apocalyptic number.

It is an amenable number.

167478221 is a deficient number, since it is larger than the sum of its proper divisors (1).

167478221 is an equidigital number, since it uses as much as digits as its factorization.

167478221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 167478221 is about 12941.3376820173. The cubic root of 167478221 is about 551.2129933696.

The spelling of 167478221 in words is "one hundred sixty-seven million, four hundred seventy-eight thousand, two hundred twenty-one".