167221487 has 2 divisors, whose sum is σ = 167221488. Its totient is φ = 167221486.

The previous prime is 167221459. The next prime is 167221499. The reversal of 167221487 is 784122761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 167221487 - 2⁶ = 167221423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 167221487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167226487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83610743 + 83610744.

It is an arithmetic number, because the mean of its divisors is an integer number (83610744).

Almost surely, 2^167221487 is an apocalyptic number.

167221487 is a deficient number, since it is larger than the sum of its proper divisors (1).

167221487 is an equidigital number, since it uses as much as digits as its factorization.

167221487 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 167221487 is about 12931.4147331218. The cubic root of 167221487 is about 550.9311905800.

The spelling of 167221487 in words is "one hundred sixty-seven million, two hundred twenty-one thousand, four hundred eighty-seven".