997517471 has 2 divisors, whose sum is σ = 997517472. Its totient is φ = 997517470.

The previous prime is 997517453. The next prime is 997517491. The reversal of 997517471 is 174715799.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997517471 is a prime.

It is a super-3 number, since 3×997517471³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997517431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498758735 + 498758736.

It is an arithmetic number, because the mean of its divisors is an integer number (498758736).

Almost surely, 2^997517471 is an apocalyptic number.

997517471 is a deficient number, since it is larger than the sum of its proper divisors (1).

997517471 is an equidigital number, since it uses as much as digits as its factorization.

997517471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 555660, while the sum is 50.

The square root of 997517471 is about 31583.4999802112. The cubic root of 997517471 is about 999.1718046151.

The spelling of 997517471 in words is "nine hundred ninety-seven million, five hundred seventeen thousand, four hundred seventy-one".