172207897 has 2 divisors, whose sum is σ = 172207898. Its totient is φ = 172207896.

The previous prime is 172207817. The next prime is 172207921. The reversal of 172207897 is 798702271.

It is a happy number.

172207897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164249856 + 7958041 = 12816^2 + 2821^2 .

It is a cyclic number.

It is not a de Polignac number, because 172207897 - 2⁷ = 172207769 is a prime.

It is not a weakly prime, because it can be changed into another prime (172207817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86103948 + 86103949.

It is an arithmetic number, because the mean of its divisors is an integer number (86103949).

Almost surely, 2^172207897 is an apocalyptic number.

It is an amenable number.

172207897 is a deficient number, since it is larger than the sum of its proper divisors (1).

172207897 is an equidigital number, since it uses as much as digits as its factorization.

172207897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 172207897 is about 13122.8006538239. The cubic root of 172207897 is about 556.3537517702.

The spelling of 172207897 in words is "one hundred seventy-two million, two hundred seven thousand, eight hundred ninety-seven".