9997818431 has 8 divisors (see below), whose sum is σ = 10045011504. Its totient is φ = 9950653440.

The previous prime is 9997818419. The next prime is 9997818451. The reversal of 9997818431 is 1348187999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9997818431 - 2¹⁴ = 9997802047 is a prime.

It is a super-2 number, since 2×9997818431² (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 (9997818451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1129001 + ... + 1137821.

It is an arithmetic number, because the mean of its divisors is an integer number (1255626438).

Almost surely, 2^9997818431 is an apocalyptic number.

9997818431 is a deficient number, since it is larger than the sum of its proper divisors (47193073).

9997818431 is a wasteful number, since it uses less digits than its factorization.

9997818431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14041.

The product of its digits is 3919104, while the sum is 59.

The square root of 9997818431 is about 99989.0915600297. The cubic root of 9997818431 is about 2154.2780103733.

The spelling of 9997818431 in words is "nine billion, nine hundred ninety-seven million, eight hundred eighteen thousand, four hundred thirty-one".