7136813 has 4 divisors (see below), whose sum is σ = 7382940. Its totient is φ = 6890688.

The previous prime is 7136807. The next prime is 7136863. The reversal of 7136813 is 3186317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3186317 = 29 ⋅109873.

It can be written as a sum of positive squares in 2 ways, for example, as 6061444 + 1075369 = 2462^2 + 1037^2 .

It is a cyclic number.

It is not a de Polignac number, because 7136813 - 2⁴ = 7136797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 246097 = 7136813 / (7 + 1 + 3 + 6 + 8 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7136863) 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, 123020 + ... + 123077.

It is an arithmetic number, because the mean of its divisors is an integer number (1845735).

Almost surely, 2^7136813 is an apocalyptic number.

It is an amenable number.

7136813 is a deficient number, since it is larger than the sum of its proper divisors (246127).

7136813 is a wasteful number, since it uses less digits than its factorization.

7136813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246126.

The product of its digits is 3024, while the sum is 29.

The square root of 7136813 is about 2671.4814242289. The cubic root of 7136813 is about 192.5313425100.

The spelling of 7136813 in words is "seven million, one hundred thirty-six thousand, eight hundred thirteen".