167521217 has 2 divisors, whose sum is σ = 167521218. Its totient is φ = 167521216.

The previous prime is 167521201. The next prime is 167521219. The reversal of 167521217 is 712125761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152744881 + 14776336 = 12359^2 + 3844^2 .

It is a cyclic number.

It is not a de Polignac number, because 167521217 - 2⁴ = 167521201 is a prime.

It is a super-2 number, since 2×167521217² = 56126716290322178, which contains 22 as substring.

Together with 167521219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (167521219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83760608 + 83760609.

It is an arithmetic number, because the mean of its divisors is an integer number (83760609).

Almost surely, 2^167521217 is an apocalyptic number.

It is an amenable number.

167521217 is a deficient number, since it is larger than the sum of its proper divisors (1).

167521217 is an equidigital number, since it uses as much as digits as its factorization.

167521217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 32.

The square root of 167521217 is about 12942.9987638105. The cubic root of 167521217 is about 551.2601595542.

Adding to 167521217 its sum of digits (32), we get a square (167521249 = 12943²).

Adding to 167521217 its reverse (712125761), we get a palindrome (879646978).

The spelling of 167521217 in words is "one hundred sixty-seven million, five hundred twenty-one thousand, two hundred seventeen".