5091221777 has 2 divisors, whose sum is σ = 5091221778. Its totient is φ = 5091221776.

The previous prime is 5091221713. The next prime is 5091221783. The reversal of 5091221777 is 7771221905.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2710660096 + 2380561681 = 52064^2 + 48791^2 .

It is a cyclic number.

It is not a de Polignac number, because 5091221777 - 2⁶ = 5091221713 is a prime.

It is not a weakly prime, because it can be changed into another prime (5091221477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2545610888 + 2545610889.

It is an arithmetic number, because the mean of its divisors is an integer number (2545610889).

Almost surely, 2^5091221777 is an apocalyptic number.

It is an amenable number.

5091221777 is a deficient number, since it is larger than the sum of its proper divisors (1).

5091221777 is an equidigital number, since it uses as much as digits as its factorization.

5091221777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61740, while the sum is 41.

The square root of 5091221777 is about 71352.7979619580. The cubic root of 5091221777 is about 1720.3124744395.

The spelling of 5091221777 in words is "five billion, ninety-one million, two hundred twenty-one thousand, seven hundred seventy-seven".