127144432395581 has 2 divisors, whose sum is σ = 127144432395582. Its totient is φ = 127144432395580.

The previous prime is 127144432395523. The next prime is 127144432395583. The reversal of 127144432395581 is 185593234441721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127144432395556 + 25 = 11275834^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 127144432395581 - 2²⁶ = 127144365286717 is a prime.

It is a super-2 number, since 2×127144432395581² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 127144432395583, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 127144432395581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127144432395583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63572216197790 + 63572216197791.

It is an arithmetic number, because the mean of its divisors is an integer number (63572216197791).

Almost surely, 2^{127144432395581} is an apocalyptic number.

It is an amenable number.

127144432395581 is a deficient number, since it is larger than the sum of its proper divisors (1).

127144432395581 is an equidigital number, since it uses as much as digits as its factorization.

127144432395581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 59.

The spelling of 127144432395581 in words is "one hundred twenty-seven trillion, one hundred forty-four billion, four hundred thirty-two million, three hundred ninety-five thousand, five hundred eighty-one".