5181813 has 80 divisors (see below), whose sum is σ = 10299520. Its totient is φ = 2519424.

The previous prime is 5181811. The next prime is 5181817. The reversal of 5181813 is 3181815.

It is not a de Polignac number, because 5181813 - 2¹ = 5181811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181811) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 140031 + ... + 140067.

It is an arithmetic number, because the mean of its divisors is an integer number (128744).

Almost surely, 2^5181813 is an apocalyptic number.

It is an amenable number.

5181813 is a deficient number, since it is larger than the sum of its proper divisors (5117707).

5181813 is a wasteful number, since it uses less digits than its factorization.

5181813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 79 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 5181813 is about 2276.3595937373. The cubic root of 5181813 is about 173.0456070521.

The spelling of 5181813 in words is "five million, one hundred eighty-one thousand, eight hundred thirteen".