1276400251387 has 2 divisors, whose sum is σ = 1276400251388. Its totient is φ = 1276400251386.

The previous prime is 1276400251349. The next prime is 1276400251391. The reversal of 1276400251387 is 7831520046721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1276400251387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1276400251307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638200125693 + 638200125694.

It is an arithmetic number, because the mean of its divisors is an integer number (638200125694).

Almost surely, 2^{1276400251387} is an apocalyptic number.

1276400251387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276400251387 is an equidigital number, since it uses as much as digits as its factorization.

1276400251387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 1276400251387 in words is "one trillion, two hundred seventy-six billion, four hundred million, two hundred fifty-one thousand, three hundred eighty-seven".