1306421587 has 2 divisors, whose sum is σ = 1306421588. Its totient is φ = 1306421586.

The previous prime is 1306421579. The next prime is 1306421603. The reversal of 1306421587 is 7851246031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1306421587 - 2³ = 1306421579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1306421507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653210793 + 653210794.

It is an arithmetic number, because the mean of its divisors is an integer number (653210794).

Almost surely, 2^1306421587 is an apocalyptic number.

1306421587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306421587 is an equidigital number, since it uses as much as digits as its factorization.

1306421587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1306421587 is about 36144.4544432476. The cubic root of 1306421587 is about 1093.1869769163.

The spelling of 1306421587 in words is "one billion, three hundred six million, four hundred twenty-one thousand, five hundred eighty-seven".