9772787881 has 2 divisors, whose sum is σ = 9772787882. Its totient is φ = 9772787880.

The previous prime is 9772787831. The next prime is 9772787887. The reversal of 9772787881 is 1887872779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6904114281 + 2868673600 = 83091^2 + 53560^2 .

It is a cyclic number.

It is not a de Polignac number, because 9772787881 - 2⁷ = 9772787753 is a prime.

It is a super-2 number, since 2×9772787881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9772787887) 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, 4886393940 + 4886393941.

It is an arithmetic number, because the mean of its divisors is an integer number (4886393941).

Almost surely, 2^9772787881 is an apocalyptic number.

It is an amenable number.

9772787881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9772787881 is an equidigital number, since it uses as much as digits as its factorization.

9772787881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22127616, while the sum is 64.

The square root of 9772787881 is about 98857.4118667892. The cubic root of 9772787881 is about 2137.9924020734.

The spelling of 9772787881 in words is "nine billion, seven hundred seventy-two million, seven hundred eighty-seven thousand, eight hundred eighty-one".