1301428721 has 2 divisors, whose sum is σ = 1301428722. Its totient is φ = 1301428720.

The previous prime is 1301428663. The next prime is 1301428741. The reversal of 1301428721 is 1278241031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1246090000 + 55338721 = 35300^2 + 7439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1301428721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1301428741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650714360 + 650714361.

It is an arithmetic number, because the mean of its divisors is an integer number (650714361).

Almost surely, 2^1301428721 is an apocalyptic number.

It is an amenable number.

1301428721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301428721 is an equidigital number, since it uses as much as digits as its factorization.

1301428721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1301428721 is about 36075.3201094599. The cubic root of 1301428721 is about 1091.7925561507.

Adding to 1301428721 its reverse (1278241031), we get a palindrome (2579669752).

The spelling of 1301428721 in words is "one billion, three hundred one million, four hundred twenty-eight thousand, seven hundred twenty-one".