9975781 has 8 divisors (see below), whose sum is σ = 10124928. Its totient is φ = 9828000.

The previous prime is 9975773. The next prime is 9975803. The reversal of 9975781 is 1875799.

9975781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9975781 - 2³ = 9975773 is a prime.

It is a super-2 number, since 2×9975781² = 199032413119922, 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 (9975181) 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 7 ways as a sum of consecutive naturals, for example, 35361 + ... + 35641.

It is an arithmetic number, because the mean of its divisors is an integer number (1265616).

Almost surely, 2^9975781 is an apocalyptic number.

9975781 is the 1413-rd centered decagonal number.

It is an amenable number.

9975781 is a deficient number, since it is larger than the sum of its proper divisors (149147).

9975781 is a wasteful number, since it uses less digits than its factorization.

9975781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683.

The product of its digits is 158760, while the sum is 46.

The square root of 9975781 is about 3158.4459786420. The cubic root of 9975781 is about 215.2694008898.

The spelling of 9975781 in words is "nine million, nine hundred seventy-five thousand, seven hundred eighty-one".