997172017 has 2 divisors, whose sum is σ = 997172018. Its totient is φ = 997172016.

The previous prime is 997171999. The next prime is 997172053. The reversal of 997172017 is 710271799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 699919936 + 297252081 = 26456^2 + 17241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997172017 is a prime.

It is not a weakly prime, because it can be changed into another prime (997172087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498586008 + 498586009.

It is an arithmetic number, because the mean of its divisors is an integer number (498586009).

Almost surely, 2^997172017 is an apocalyptic number.

It is an amenable number.

997172017 is a deficient number, since it is larger than the sum of its proper divisors (1).

997172017 is an equidigital number, since it uses as much as digits as its factorization.

997172017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55566, while the sum is 43.

The square root of 997172017 is about 31578.0306067367. The cubic root of 997172017 is about 999.0564489915.

The spelling of 997172017 in words is "nine hundred ninety-seven million, one hundred seventy-two thousand, seventeen".