1271012521 has 2 divisors, whose sum is σ = 1271012522. Its totient is φ = 1271012520.

The previous prime is 1271012507. The next prime is 1271012537. The reversal of 1271012521 is 1252101721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 947408400 + 323604121 = 30780^2 + 17989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271012521 - 2⁹ = 1271012009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1271012492 and 1271012501.

It is not a weakly prime, because it can be changed into another prime (1271012221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635506260 + 635506261.

It is an arithmetic number, because the mean of its divisors is an integer number (635506261).

Almost surely, 2^1271012521 is an apocalyptic number.

It is an amenable number.

1271012521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271012521 is an equidigital number, since it uses as much as digits as its factorization.

1271012521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 1271012521 is about 35651.2625442634. The cubic root of 1271012521 is about 1083.2198494353.

The spelling of 1271012521 in words is "one billion, two hundred seventy-one million, twelve thousand, five hundred twenty-one".