172122257 has 2 divisors, whose sum is σ = 172122258. Its totient is φ = 172122256.

The previous prime is 172122253. The next prime is 172122289. The reversal of 172122257 is 752221271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113124496 + 58997761 = 10636^2 + 7681^2 .

It is a cyclic number.

It is not a de Polignac number, because 172122257 - 2² = 172122253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172122253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86061128 + 86061129.

It is an arithmetic number, because the mean of its divisors is an integer number (86061129).

Almost surely, 2^172122257 is an apocalyptic number.

It is an amenable number.

172122257 is a deficient number, since it is larger than the sum of its proper divisors (1).

172122257 is an equidigital number, since it uses as much as digits as its factorization.

172122257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3920, while the sum is 29.

The square root of 172122257 is about 13119.5372250701. The cubic root of 172122257 is about 556.2615104802.

The spelling of 172122257 in words is "one hundred seventy-two million, one hundred twenty-two thousand, two hundred fifty-seven".