127913521 has 2 divisors, whose sum is σ = 127913522. Its totient is φ = 127913520.

The previous prime is 127913507. The next prime is 127913531. The reversal of 127913521 is 125319721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90459121 + 37454400 = 9511^2 + 6120^2 .

It is a cyclic number.

It is not a de Polignac number, because 127913521 - 2⁷ = 127913393 is a prime.

It is not a weakly prime, because it can be changed into another prime (127913531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63956760 + 63956761.

It is an arithmetic number, because the mean of its divisors is an integer number (63956761).

Almost surely, 2^127913521 is an apocalyptic number.

It is an amenable number.

127913521 is a deficient number, since it is larger than the sum of its proper divisors (1).

127913521 is an equidigital number, since it uses as much as digits as its factorization.

127913521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 127913521 is about 11309.8859852785. The cubic root of 127913521 is about 503.8548978128.

The spelling of 127913521 in words is "one hundred twenty-seven million, nine hundred thirteen thousand, five hundred twenty-one".