9897538479 has 4 divisors (see below), whose sum is σ = 13196717976. Its totient is φ = 6598358984.

The previous prime is 9897538447. The next prime is 9897538493. The reversal of 9897538479 is 9748357989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9897538479 - 2⁵ = 9897538447 is a prime.

It is a super-2 number, since 2×9897538479² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897538429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649589744 + ... + 1649589749.

It is an arithmetic number, because the mean of its divisors is an integer number (3299179494).

Almost surely, 2^9897538479 is an apocalyptic number.

9897538479 is a deficient number, since it is larger than the sum of its proper divisors (3299179497).

9897538479 is a wasteful number, since it uses less digits than its factorization.

9897538479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299179496.

The product of its digits is 137168640, while the sum is 69.

The square root of 9897538479 is about 99486.3733332359. The cubic root of 9897538479 is about 2147.0511929985.

The spelling of 9897538479 in words is "nine billion, eight hundred ninety-seven million, five hundred thirty-eight thousand, four hundred seventy-nine".