13533409 has 2 divisors, whose sum is σ = 13533410. Its totient is φ = 13533408.

The previous prime is 13533383. The next prime is 13533413. The reversal of 13533409 is 90433531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11751184 + 1782225 = 3428^2 + 1335^2 .

It is an emirp because it is prime and its reverse (90433531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13533409 is a prime.

It is a super-2 number, since 2×13533409² = 366306318322562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13533419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6766704 + 6766705.

It is an arithmetic number, because the mean of its divisors is an integer number (6766705).

Almost surely, 2^13533409 is an apocalyptic number.

It is an amenable number.

13533409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13533409 is an equidigital number, since it uses as much as digits as its factorization.

13533409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 13533409 is about 3678.7781939117. The cubic root of 13533409 is about 238.3064162906.

The spelling of 13533409 in words is "thirteen million, five hundred thirty-three thousand, four hundred nine".