1309425787 has 2 divisors, whose sum is σ = 1309425788. Its totient is φ = 1309425786.

The previous prime is 1309425773. The next prime is 1309425883. The reversal of 1309425787 is 7875249031.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1309425787 is a prime.

It is not a weakly prime, because it can be changed into another prime (1309425727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654712893 + 654712894.

It is an arithmetic number, because the mean of its divisors is an integer number (654712894).

Almost surely, 2^1309425787 is an apocalyptic number.

1309425787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309425787 is an equidigital number, since it uses as much as digits as its factorization.

1309425787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 1309425787 is about 36185.9888216420. The cubic root of 1309425787 is about 1094.0242865534.

The spelling of 1309425787 in words is "one billion, three hundred nine million, four hundred twenty-five thousand, seven hundred eighty-seven".