9981929 has 2 divisors, whose sum is σ = 9981930. Its totient is φ = 9981928.

The previous prime is 9981919. The next prime is 9981943. The reversal of 9981929 is 9291899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 2474329 = 2740^2 + 1573^2 .

It is a cyclic number.

It is not a de Polignac number, because 9981929 - 2⁴ = 9981913 is a prime.

It is a super-2 number, since 2×9981929² = 199277813122082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9981919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990964 + 4990965.

It is an arithmetic number, because the mean of its divisors is an integer number (4990965).

Almost surely, 2^9981929 is an apocalyptic number.

It is an amenable number.

9981929 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981929 is an equidigital number, since it uses as much as digits as its factorization.

9981929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 47.

The square root of 9981929 is about 3159.4190921750. The cubic root of 9981929 is about 215.3136147876.

It can be divided in two parts, 99 and 81929, that added together give a palindrome (82028).

The spelling of 9981929 in words is "nine million, nine hundred eighty-one thousand, nine hundred twenty-nine".