2077781317 has 2 divisors, whose sum is σ = 2077781318. Its totient is φ = 2077781316.

The previous prime is 2077781297. The next prime is 2077781369. The reversal of 2077781317 is 7131877702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1957089121 + 120692196 = 44239^2 + 10986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2077781317 - 2¹⁵ = 2077748549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2077781617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1038890658 + 1038890659.

It is an arithmetic number, because the mean of its divisors is an integer number (1038890659).

Almost surely, 2^2077781317 is an apocalyptic number.

It is an amenable number.

2077781317 is a deficient number, since it is larger than the sum of its proper divisors (1).

2077781317 is an equidigital number, since it uses as much as digits as its factorization.

2077781317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115248, while the sum is 43.

The square root of 2077781317 is about 45582.6865926088. The cubic root of 2077781317 is about 1276.0468279854.

The spelling of 2077781317 in words is "two billion, seventy-seven million, seven hundred eighty-one thousand, three hundred seventeen".