9965881 has 2 divisors, whose sum is σ = 9965882. Its totient is φ = 9965880.

The previous prime is 9965869. The next prime is 9965903. The reversal of 9965881 is 1885699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 608400 = 3059^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 9965881 - 2⁹ = 9965369 is a prime.

It is a super-2 number, since 2×9965881² = 198637568212322, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 9965881 parts by 4464 straight cuts.

9965881 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9965801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982940 + 4982941.

It is an arithmetic number, because the mean of its divisors is an integer number (4982941).

Almost surely, 2^9965881 is an apocalyptic number.

It is an amenable number.

9965881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965881 is an equidigital number, since it uses as much as digits as its factorization.

9965881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 46.

The square root of 9965881 is about 3156.8783631936. The cubic root of 9965881 is about 215.1981659508.

The spelling of 9965881 in words is "nine million, nine hundred sixty-five thousand, eight hundred eighty-one".