9899531 has 2 divisors, whose sum is σ = 9899532. Its totient is φ = 9899530.

The previous prime is 9899501. The next prime is 9899567. The reversal of 9899531 is 1359989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9899531 - 2⁶ = 9899467 is a prime.

It is a super-2 number, since 2×9899531² = 196001428039922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9899501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949765 + 4949766.

It is an arithmetic number, because the mean of its divisors is an integer number (4949766).

Almost surely, 2^9899531 is an apocalyptic number.

9899531 is a deficient number, since it is larger than the sum of its proper divisors (1).

9899531 is an equidigital number, since it uses as much as digits as its factorization.

9899531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 44.

The square root of 9899531 is about 3146.3520146354. The cubic root of 9899531 is about 214.7195261060.

The spelling of 9899531 in words is "nine million, eight hundred ninety-nine thousand, five hundred thirty-one".