9940813281 has 24 divisors (see below), whose sum is σ = 17273929920. Its totient is φ = 5381492256.

The previous prime is 9940813277. The next prime is 9940813373. The reversal of 9940813281 is 1823180499.

It is not a de Polignac number, because 9940813281 - 2² = 9940813277 is a prime.

It is a super-2 number, since 2×9940813281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9940813261) 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 in 23 ways as a sum of consecutive naturals, for example, 4151190 + ... + 4153583.

It is an arithmetic number, because the mean of its divisors is an integer number (719747080).

Almost surely, 2^9940813281 is an apocalyptic number.

It is an amenable number.

9940813281 is a deficient number, since it is larger than the sum of its proper divisors (7333116639).

9940813281 is a wasteful number, since it uses less digits than its factorization.

9940813281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8304805 (or 8304802 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 9940813281 is about 99703.6272208790. The cubic root of 9940813281 is about 2150.1758126284.

The spelling of 9940813281 in words is "nine billion, nine hundred forty million, eight hundred thirteen thousand, two hundred eighty-one".