997272169 has 2 divisors, whose sum is σ = 997272170. Its totient is φ = 997272168.

The previous prime is 997272161. The next prime is 997272191. The reversal of 997272169 is 961272799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 875390569 + 121881600 = 29587^2 + 11040^2 .

It is an emirp because it is prime and its reverse (961272799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997272169 - 2³ = 997272161 is a prime.

It is a super-2 number, since 2×997272169² = 1989103558123929122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (997272161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498636084 + 498636085.

It is an arithmetic number, because the mean of its divisors is an integer number (498636085).

Almost surely, 2^997272169 is an apocalyptic number.

997272169 is the 18233-rd hex number.

It is an amenable number.

997272169 is a deficient number, since it is larger than the sum of its proper divisors (1).

997272169 is an equidigital number, since it uses as much as digits as its factorization.

997272169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 52.

The square root of 997272169 is about 31579.6163529578. The cubic root of 997272169 is about 999.0898949601.

The spelling of 997272169 in words is "nine hundred ninety-seven million, two hundred seventy-two thousand, one hundred sixty-nine".