1296503921 has 2 divisors, whose sum is σ = 1296503922. Its totient is φ = 1296503920.

The previous prime is 1296503903. The next prime is 1296503947. The reversal of 1296503921 is 1293056921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1284218896 + 12285025 = 35836^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1296503921 - 2¹⁰ = 1296502897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1296503321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648251960 + 648251961.

It is an arithmetic number, because the mean of its divisors is an integer number (648251961).

Almost surely, 2^1296503921 is an apocalyptic number.

It is an amenable number.

1296503921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296503921 is an equidigital number, since it uses as much as digits as its factorization.

1296503921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 1296503921 is about 36006.9982225678. The cubic root of 1296503921 is about 1090.4136468367.

The spelling of 1296503921 in words is "one billion, two hundred ninety-six million, five hundred three thousand, nine hundred twenty-one".