1356489509 has 2 divisors, whose sum is σ = 1356489510. Its totient is φ = 1356489508.

The previous prime is 1356489457. The next prime is 1356489527. The reversal of 1356489509 is 9059846531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930067009 + 426422500 = 30497^2 + 20650^2 .

It is an emirp because it is prime and its reverse (9059846531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1356489509 - 2¹² = 1356485413 is a prime.

It is a super-2 number, since 2×1356489509² = 3680127576054122162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1356489539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678244754 + 678244755.

It is an arithmetic number, because the mean of its divisors is an integer number (678244755).

Almost surely, 2^1356489509 is an apocalyptic number.

It is an amenable number.

1356489509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356489509 is an equidigital number, since it uses as much as digits as its factorization.

1356489509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 1356489509 is about 36830.5512991592. The cubic root of 1356489509 is about 1106.9775495420.

The spelling of 1356489509 in words is "one billion, three hundred fifty-six million, four hundred eighty-nine thousand, five hundred nine".