127769009491 has 2 divisors, whose sum is σ = 127769009492. Its totient is φ = 127769009490.

The previous prime is 127769009483. The next prime is 127769009549. The reversal of 127769009491 is 194900967721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127769009491 - 2³ = 127769009483 is a prime.

It is a super-2 number, since 2×127769009491² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127769009591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63884504745 + 63884504746.

It is an arithmetic number, because the mean of its divisors is an integer number (63884504746).

Almost surely, 2^127769009491 is an apocalyptic number.

127769009491 is a deficient number, since it is larger than the sum of its proper divisors (1).

127769009491 is an equidigital number, since it uses as much as digits as its factorization.

127769009491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 127769009491 in words is "one hundred twenty-seven billion, seven hundred sixty-nine million, nine thousand, four hundred ninety-one".