172944497197 has 2 divisors, whose sum is σ = 172944497198. Its totient is φ = 172944497196.

The previous prime is 172944497161. The next prime is 172944497207. The reversal of 172944497197 is 791794449271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172832264361 + 112232836 = 415731^2 + 10594^2 .

It is a cyclic number.

It is not a de Polignac number, because 172944497197 - 2³¹ = 170797013549 is a prime.

It is a super-2 number, since 2×172944497197² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172944497497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86472248598 + 86472248599.

It is an arithmetic number, because the mean of its divisors is an integer number (86472248599).

Almost surely, 2^172944497197 is an apocalyptic number.

It is an amenable number.

172944497197 is a deficient number, since it is larger than the sum of its proper divisors (1).

172944497197 is an equidigital number, since it uses as much as digits as its factorization.

172944497197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 64.

The spelling of 172944497197 in words is "one hundred seventy-two billion, nine hundred forty-four million, four hundred ninety-seven thousand, one hundred ninety-seven".