9941563681 has 4 divisors (see below), whose sum is σ = 11361787072. Its totient is φ = 8521340292.

The previous prime is 9941563651. The next prime is 9941563703. The reversal of 9941563681 is 1863651499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9941563681 - 2²³ = 9933175073 is a prime.

It is a super-2 number, since 2×9941563681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9941563651) 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 in 3 ways as a sum of consecutive naturals, for example, 710111685 + ... + 710111698.

It is an arithmetic number, because the mean of its divisors is an integer number (2840446768).

Almost surely, 2^9941563681 is an apocalyptic number.

It is an amenable number.

9941563681 is a deficient number, since it is larger than the sum of its proper divisors (1420223391).

9941563681 is a wasteful number, since it uses less digits than its factorization.

9941563681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420223390.

The product of its digits is 1399680, while the sum is 52.

The square root of 9941563681 is about 99707.3903028256. The cubic root of 9941563681 is about 2150.2299145510.

The spelling of 9941563681 in words is "nine billion, nine hundred forty-one million, five hundred sixty-three thousand, six hundred eighty-one".