9997571 has 6 divisors (see below), whose sum is σ = 10451700. Its totient is φ = 9562388.

The previous prime is 9997523. The next prime is 9997573. The reversal of 9997571 is 1757999.

It is a happy number.

It is not a de Polignac number, because 9997571 - 2²² = 5803267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9997573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8921 + ... + 9978.

It is an arithmetic number, because the mean of its divisors is an integer number (1741950).

Almost surely, 2^9997571 is an apocalyptic number.

9997571 is a deficient number, since it is larger than the sum of its proper divisors (454129).

9997571 is a wasteful number, since it uses less digits than its factorization.

9997571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18945 (or 18922 counting only the distinct ones).

The product of its digits is 178605, while the sum is 47.

The square root of 9997571 is about 3161.8935782218. The cubic root of 9997571 is about 215.4260238511.

The spelling of 9997571 in words is "nine million, nine hundred ninety-seven thousand, five hundred seventy-one".