1277626390121 has 2 divisors, whose sum is σ = 1277626390122. Its totient is φ = 1277626390120.

The previous prime is 1277626390087. The next prime is 1277626390141. The reversal of 1277626390121 is 1210936267721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 857826063721 + 419800326400 = 926189^2 + 647920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1277626390121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1277626390141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638813195060 + 638813195061.

It is an arithmetic number, because the mean of its divisors is an integer number (638813195061).

Almost surely, 2^{1277626390121} is an apocalyptic number.

It is an amenable number.

1277626390121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277626390121 is an equidigital number, since it uses as much as digits as its factorization.

1277626390121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 1277626390121 in words is "one trillion, two hundred seventy-seven billion, six hundred twenty-six million, three hundred ninety thousand, one hundred twenty-one".