9969781 has 4 divisors (see below), whose sum is σ = 10181952. Its totient is φ = 9757612.

The previous prime is 9969731. The next prime is 9969793. The reversal of 9969781 is 1879699.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1879699 = 347 ⋅5417.

It is a cyclic number.

It is not a de Polignac number, because 9969781 - 2⁷ = 9969653 is a prime.

It is a super-2 number, since 2×9969781² = 198793066375922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9969731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106015 + ... + 106108.

It is an arithmetic number, because the mean of its divisors is an integer number (2545488).

Almost surely, 2^9969781 is an apocalyptic number.

It is an amenable number.

9969781 is a deficient number, since it is larger than the sum of its proper divisors (212171).

9969781 is a wasteful number, since it uses less digits than its factorization.

9969781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212170.

The product of its digits is 244944, while the sum is 49.

The square root of 9969781 is about 3157.4960015810. The cubic root of 9969781 is about 215.2262338287.

The spelling of 9969781 in words is "nine million, nine hundred sixty-nine thousand, seven hundred eighty-one".