135219509 has 2 divisors, whose sum is σ = 135219510. Its totient is φ = 135219508.

The previous prime is 135219503. The next prime is 135219541. The reversal of 135219509 is 905912531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 55920484 = 8905^2 + 7478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135219509 is a prime.

It is a super-2 number, since 2×135219509² = 36568631228402162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135219503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67609754 + 67609755.

It is an arithmetic number, because the mean of its divisors is an integer number (67609755).

Almost surely, 2^135219509 is an apocalyptic number.

It is an amenable number.

135219509 is a deficient number, since it is larger than the sum of its proper divisors (1).

135219509 is an equidigital number, since it uses as much as digits as its factorization.

135219509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 135219509 is about 11628.3923652412. The cubic root of 135219509 is about 513.2706742638.

The spelling of 135219509 in words is "one hundred thirty-five million, two hundred nineteen thousand, five hundred nine".