171222131 has 2 divisors, whose sum is σ = 171222132. Its totient is φ = 171222130.

The previous prime is 171222089. The next prime is 171222137. The reversal of 171222131 is 131222171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171222131 - 2¹⁰ = 171221107 is a prime.

It is a super-2 number, since 2×171222131² = 58634036288362322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171222137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85611065 + 85611066.

It is an arithmetic number, because the mean of its divisors is an integer number (85611066).

Almost surely, 2^171222131 is an apocalyptic number.

171222131 is a deficient number, since it is larger than the sum of its proper divisors (1).

171222131 is an equidigital number, since it uses as much as digits as its factorization.

171222131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 20.

The square root of 171222131 is about 13085.1874652219. The cubic root of 171222131 is about 555.2901450737.

The spelling of 171222131 in words is "one hundred seventy-one million, two hundred twenty-two thousand, one hundred thirty-one".