2139572777 has 2 divisors, whose sum is σ = 2139572778. Its totient is φ = 2139572776.

The previous prime is 2139572737. The next prime is 2139572783. The reversal of 2139572777 is 7772759312.

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., 1983722521 + 155850256 = 44539^2 + 12484^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139572777 - 2⁶ = 2139572713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2139572737) 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, 1069786388 + 1069786389.

It is an arithmetic number, because the mean of its divisors is an integer number (1069786389).

Almost surely, 2^2139572777 is an apocalyptic number.

It is an amenable number.

2139572777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139572777 is an equidigital number, since it uses as much as digits as its factorization.

2139572777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296540, while the sum is 50.

The square root of 2139572777 is about 46255.5161791542. The cubic root of 2139572777 is about 1288.5729822159.

The spelling of 2139572777 in words is "two billion, one hundred thirty-nine million, five hundred seventy-two thousand, seven hundred seventy-seven".