9780731 has 2 divisors, whose sum is σ = 9780732. Its totient is φ = 9780730.

The previous prime is 9780721. The next prime is 9780761. The reversal of 9780731 is 1370879.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9780731 is a prime.

It is a super-2 number, since 2×9780731² = 191325397788722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 9780691 and 9780700.

It is not a weakly prime, because it can be changed into another prime (9780721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4890365 + 4890366.

It is an arithmetic number, because the mean of its divisors is an integer number (4890366).

Almost surely, 2^9780731 is an apocalyptic number.

9780731 is a deficient number, since it is larger than the sum of its proper divisors (1).

9780731 is an equidigital number, since it uses as much as digits as its factorization.

9780731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 9780731 is about 3127.4160260509. The cubic root of 9780731 is about 213.8571483819.

The spelling of 9780731 in words is "nine million, seven hundred eighty thousand, seven hundred thirty-one".