172219969 has 2 divisors, whose sum is σ = 172219970. Its totient is φ = 172219968.

The previous prime is 172219909. The next prime is 172219981. The reversal of 172219969 is 969912271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170563600 + 1656369 = 13060^2 + 1287^2 .

It is a cyclic number.

It is not a de Polignac number, because 172219969 - 2⁷ = 172219841 is a prime.

It is a super-2 number, since 2×172219969² = 59319435444721922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172219909) 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, 86109984 + 86109985.

It is an arithmetic number, because the mean of its divisors is an integer number (86109985).

Almost surely, 2^172219969 is an apocalyptic number.

It is an amenable number.

172219969 is a deficient number, since it is larger than the sum of its proper divisors (1).

172219969 is an equidigital number, since it uses as much as digits as its factorization.

172219969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 172219969 is about 13123.2606085530. The cubic root of 172219969 is about 556.3667518429.

The spelling of 172219969 in words is "one hundred seventy-two million, two hundred nineteen thousand, nine hundred sixty-nine".