13542809 has 4 divisors (see below), whose sum is σ = 15477504. Its totient is φ = 11608116.

The previous prime is 13542803. The next prime is 13542811. The reversal of 13542809 is 90824531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90824531 = 7 ⋅12974933.

It is a cyclic number.

It is not a de Polignac number, because 13542809 - 2⁸ = 13542553 is a prime.

It is a super-2 number, since 2×13542809² = 366815351220962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13542803) 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 in 3 ways as a sum of consecutive naturals, for example, 967337 + ... + 967350.

It is an arithmetic number, because the mean of its divisors is an integer number (3869376).

Almost surely, 2^13542809 is an apocalyptic number.

It is an amenable number.

13542809 is a deficient number, since it is larger than the sum of its proper divisors (1934695).

13542809 is an equidigital number, since it uses as much as digits as its factorization.

13542809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934694.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 13542809 is about 3680.0555702326. The cubic root of 13542809 is about 238.3615776048.

The spelling of 13542809 in words is "thirteen million, five hundred forty-two thousand, eight hundred nine".