172129597 has 2 divisors, whose sum is σ = 172129598. Its totient is φ = 172129596.

The previous prime is 172129591. The next prime is 172129613. The reversal of 172129597 is 795921271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136679481 + 35450116 = 11691^2 + 5954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172129597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172129591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86064798 + 86064799.

It is an arithmetic number, because the mean of its divisors is an integer number (86064799).

Almost surely, 2^172129597 is an apocalyptic number.

It is an amenable number.

172129597 is a deficient number, since it is larger than the sum of its proper divisors (1).

172129597 is an equidigital number, since it uses as much as digits as its factorization.

172129597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 43.

The square root of 172129597 is about 13119.8169575646. The cubic root of 172129597 is about 556.2694174596.

The spelling of 172129597 in words is "one hundred seventy-two million, one hundred twenty-nine thousand, five hundred ninety-seven".