172206257 has 2 divisors, whose sum is σ = 172206258. Its totient is φ = 172206256.

The previous prime is 172206247. The next prime is 172206319. The reversal of 172206257 is 752602271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169234081 + 2972176 = 13009^2 + 1724^2 .

It is a cyclic number.

It is not a de Polignac number, because 172206257 - 2⁴ = 172206241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172206247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86103128 + 86103129.

It is an arithmetic number, because the mean of its divisors is an integer number (86103129).

Almost surely, 2^172206257 is an apocalyptic number.

It is an amenable number.

172206257 is a deficient number, since it is larger than the sum of its proper divisors (1).

172206257 is an equidigital number, since it uses as much as digits as its factorization.

172206257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 172206257 is about 13122.7381670138. The cubic root of 172206257 is about 556.3519856432.

The spelling of 172206257 in words is "one hundred seventy-two million, two hundred six thousand, two hundred fifty-seven".