167198821 has 2 divisors, whose sum is σ = 167198822. Its totient is φ = 167198820.

The previous prime is 167198809. The next prime is 167198851. The reversal of 167198821 is 128891761.

It is a happy number.

167198821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 30636225 = 11686^2 + 5535^2 .

It is a cyclic number.

It is not a de Polignac number, because 167198821 - 2¹¹ = 167196773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167198851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83599410 + 83599411.

It is an arithmetic number, because the mean of its divisors is an integer number (83599411).

Almost surely, 2^167198821 is an apocalyptic number.

It is an amenable number.

167198821 is a deficient number, since it is larger than the sum of its proper divisors (1).

167198821 is an equidigital number, since it uses as much as digits as its factorization.

167198821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 43.

The square root of 167198821 is about 12930.5383105268. The cubic root of 167198821 is about 550.9062975059.

The spelling of 167198821 in words is "one hundred sixty-seven million, one hundred ninety-eight thousand, eight hundred twenty-one".