9977777 has 2 divisors, whose sum is σ = 9977778. Its totient is φ = 9977776.

The previous prime is 9977767. The next prime is 9977783. The reversal of 9977777 is 7777799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8042896 + 1934881 = 2836^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 9977777 - 2²² = 5783473 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 (9977767) 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 as a sum of consecutive naturals, namely, 4988888 + 4988889.

It is an arithmetic number, because the mean of its divisors is an integer number (4988889).

Almost surely, 2^9977777 is an apocalyptic number.

It is an amenable number.

9977777 is a deficient number, since it is larger than the sum of its proper divisors (1).

9977777 is an equidigital number, since it uses as much as digits as its factorization.

9977777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1361367, while the sum is 53.

The square root of 9977777 is about 3158.7619410142. The cubic root of 9977777 is about 215.2837572952.

The spelling of 9977777 in words is "nine million, nine hundred seventy-seven thousand, seven hundred seventy-seven".