1261499067427 has 2 divisors, whose sum is σ = 1261499067428. Its totient is φ = 1261499067426.

The previous prime is 1261499067419. The next prime is 1261499067431. The reversal of 1261499067427 is 7247609941621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1261499067427 - 2³ = 1261499067419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261499007427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630749533713 + 630749533714.

It is an arithmetic number, because the mean of its divisors is an integer number (630749533714).

Almost surely, 2^{1261499067427} is an apocalyptic number.

1261499067427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261499067427 is an equidigital number, since it uses as much as digits as its factorization.

1261499067427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 58.

The spelling of 1261499067427 in words is "one trillion, two hundred sixty-one billion, four hundred ninety-nine million, sixty-seven thousand, four hundred twenty-seven".