1306727621 has 2 divisors, whose sum is σ = 1306727622. Its totient is φ = 1306727620.

The previous prime is 1306727581. The next prime is 1306727623. The reversal of 1306727621 is 1267276031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1222271521 + 84456100 = 34961^2 + 9190^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306727621 - 2²² = 1302533317 is a prime.

Together with 1306727623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306727623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653363810 + 653363811.

It is an arithmetic number, because the mean of its divisors is an integer number (653363811).

Almost surely, 2^1306727621 is an apocalyptic number.

It is an amenable number.

1306727621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306727621 is an equidigital number, since it uses as much as digits as its factorization.

1306727621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 1306727621 is about 36148.6876801911. The cubic root of 1306727621 is about 1093.2723312580.

The spelling of 1306727621 in words is "one billion, three hundred six million, seven hundred twenty-seven thousand, six hundred twenty-one".