9940681 has 2 divisors, whose sum is σ = 9940682. Its totient is φ = 9940680.

The previous prime is 9940643. The next prime is 9940703. The reversal of 9940681 is 1860499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6996025 + 2944656 = 2645^2 + 1716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9940681 is a prime.

It is a super-2 number, since 2×9940681² = 197634277487522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9940681.

It is not a weakly prime, because it can be changed into another prime (9944681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4970340 + 4970341.

It is an arithmetic number, because the mean of its divisors is an integer number (4970341).

Almost surely, 2^9940681 is an apocalyptic number.

It is an amenable number.

9940681 is a deficient number, since it is larger than the sum of its proper divisors (1).

9940681 is an equidigital number, since it uses as much as digits as its factorization.

9940681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 9940681 is about 3152.8845522791. The cubic root of 9940681 is about 215.0166275224.

The spelling of 9940681 in words is "nine million, nine hundred forty thousand, six hundred eighty-one".