1351020809 has 2 divisors, whose sum is σ = 1351020810. Its totient is φ = 1351020808.

The previous prime is 1351020779. The next prime is 1351020817. The reversal of 1351020809 is 9080201531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177519225 + 173501584 = 34315^2 + 13172^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351020809 - 2¹² = 1351016713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1351010809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675510404 + 675510405.

It is an arithmetic number, because the mean of its divisors is an integer number (675510405).

Almost surely, 2^1351020809 is an apocalyptic number.

It is an amenable number.

1351020809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351020809 is an equidigital number, since it uses as much as digits as its factorization.

1351020809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1351020809 is about 36756.2349676895. The cubic root of 1351020809 is about 1105.4879492232.

The spelling of 1351020809 in words is "one billion, three hundred fifty-one million, twenty thousand, eight hundred nine".