9997777 has 2 divisors, whose sum is σ = 9997778. Its totient is φ = 9997776.

The previous prime is 9997753. The next prime is 9997783. The reversal of 9997777 is 7777999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9979281 + 18496 = 3159^2 + 136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997777 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (9997747) 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 as a sum of consecutive naturals, namely, 4998888 + 4998889.

It is an arithmetic number, because the mean of its divisors is an integer number (4998889).

Almost surely, 2^9997777 is an apocalyptic number.

It is an amenable number.

9997777 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997777 is an equidigital number, since it uses as much as digits as its factorization.

9997777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1750329, while the sum is 55.

The square root of 9997777 is about 3161.9261534704. The cubic root of 9997777 is about 215.4275034590.

The spelling of 9997777 in words is "nine million, nine hundred ninety-seven thousand, seven hundred seventy-seven".