172249291 has 2 divisors, whose sum is σ = 172249292. Its totient is φ = 172249290.

The previous prime is 172249283. The next prime is 172249327. The reversal of 172249291 is 192942271.

It is a weak prime.

It is an emirp because it is prime and its reverse (192942271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172249291 - 2³ = 172249283 is a prime.

It is a Chen prime.

It is equal to p_9621847 and since 172249291 and 9621847 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172249291.

It is not a weakly prime, because it can be changed into another prime (172249201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86124645 + 86124646.

It is an arithmetic number, because the mean of its divisors is an integer number (86124646).

Almost surely, 2^172249291 is an apocalyptic number.

172249291 is a deficient number, since it is larger than the sum of its proper divisors (1).

172249291 is an equidigital number, since it uses as much as digits as its factorization.

172249291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 172249291 is about 13124.3777376301. The cubic root of 172249291 is about 556.3983255337.

The spelling of 172249291 in words is "one hundred seventy-two million, two hundred forty-nine thousand, two hundred ninety-one".