2126389777 has 2 divisors, whose sum is σ = 2126389778. Its totient is φ = 2126389776.

The previous prime is 2126389763. The next prime is 2126389781. The reversal of 2126389777 is 7779836212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1398685201 + 727704576 = 37399^2 + 26976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126389777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2126389717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063194888 + 1063194889.

It is an arithmetic number, because the mean of its divisors is an integer number (1063194889).

Almost surely, 2^2126389777 is an apocalyptic number.

It is an amenable number.

2126389777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126389777 is an equidigital number, since it uses as much as digits as its factorization.

2126389777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 52.

The square root of 2126389777 is about 46112.7940706264. The cubic root of 2126389777 is about 1285.9210093886.

The spelling of 2126389777 in words is "two billion, one hundred twenty-six million, three hundred eighty-nine thousand, seven hundred seventy-seven".