1277819920241 has 2 divisors, whose sum is σ = 1277819920242. Its totient is φ = 1277819920240.

The previous prime is 1277819920217. The next prime is 1277819920337. The reversal of 1277819920241 is 1420299187721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1214688332641 + 63131587600 = 1102129^2 + 251260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1277819920241 is a prime.

It is not a weakly prime, because it can be changed into another prime (1277819920211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638909960120 + 638909960121.

It is an arithmetic number, because the mean of its divisors is an integer number (638909960121).

Almost surely, 2^{1277819920241} is an apocalyptic number.

It is an amenable number.

1277819920241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277819920241 is an equidigital number, since it uses as much as digits as its factorization.

1277819920241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The spelling of 1277819920241 in words is "one trillion, two hundred seventy-seven billion, eight hundred nineteen million, nine hundred twenty thousand, two hundred forty-one".