127763521 has 2 divisors, whose sum is σ = 127763522. Its totient is φ = 127763520.

The previous prime is 127763513. The next prime is 127763533. The reversal of 127763521 is 125367721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106832896 + 20930625 = 10336^2 + 4575^2 .

It is an emirp because it is prime and its reverse (125367721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127763521 - 2³ = 127763513 is a prime.

It is not a weakly prime, because it can be changed into another prime (127761521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63881760 + 63881761.

It is an arithmetic number, because the mean of its divisors is an integer number (63881761).

Almost surely, 2^127763521 is an apocalyptic number.

It is an amenable number.

127763521 is a deficient number, since it is larger than the sum of its proper divisors (1).

127763521 is an equidigital number, since it uses as much as digits as its factorization.

127763521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 34.

The square root of 127763521 is about 11303.2526734564. The cubic root of 127763521 is about 503.6578693932.

The spelling of 127763521 in words is "one hundred twenty-seven million, seven hundred sixty-three thousand, five hundred twenty-one".