1427317517491 has 2 divisors, whose sum is σ = 1427317517492. Its totient is φ = 1427317517490.

The previous prime is 1427317517459. The next prime is 1427317517543. The reversal of 1427317517491 is 1947157137241.

It is a happy number.

It is an a-pointer prime, because the next prime (1427317517543) can be obtained adding 1427317517491 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1427317517491 - 2⁵ = 1427317517459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1427317517401) 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, 713658758745 + 713658758746.

It is an arithmetic number, because the mean of its divisors is an integer number (713658758746).

Almost surely, 2^{1427317517491} is an apocalyptic number.

1427317517491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427317517491 is an equidigital number, since it uses as much as digits as its factorization.

1427317517491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 52.

The spelling of 1427317517491 in words is "one trillion, four hundred twenty-seven billion, three hundred seventeen million, five hundred seventeen thousand, four hundred ninety-one".