7136809 has 4 divisors (see below), whose sum is σ = 7288704. Its totient is φ = 6984916.

The previous prime is 7136807. The next prime is 7136863. The reversal of 7136809 is 9086317.

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: 9086317 = 31 ⋅293107.

It is a cyclic number.

It is not a de Polignac number, because 7136809 - 2¹ = 7136807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7136807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75877 + ... + 75970.

It is an arithmetic number, because the mean of its divisors is an integer number (1822176).

Almost surely, 2^7136809 is an apocalyptic number.

It is an amenable number.

7136809 is a deficient number, since it is larger than the sum of its proper divisors (151895).

7136809 is a wasteful number, since it uses less digits than its factorization.

7136809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151894.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 7136809 is about 2671.4806755805. The cubic root of 7136809 is about 192.5313065404.

The spelling of 7136809 in words is "seven million, one hundred thirty-six thousand, eight hundred nine".