5181381 has 8 divisors (see below), whose sum is σ = 7676160. Its totient is φ = 3454236.

The previous prime is 5181353. The next prime is 5181383. The reversal of 5181381 is 1831815.

It is not a de Polignac number, because 5181381 - 2⁵ = 5181349 is a prime.

It is a super-2 number, since 2×5181381² = 53693418134322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 191903 = 5181381 / (5 + 1 + 8 + 1 + 3 + 8 + 1).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181383) 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 7 ways as a sum of consecutive naturals, for example, 95925 + ... + 95978.

It is an arithmetic number, because the mean of its divisors is an integer number (959520).

Almost surely, 2^5181381 is an apocalyptic number.

It is an amenable number.

5181381 is a deficient number, since it is larger than the sum of its proper divisors (2494779).

5181381 is a wasteful number, since it uses less digits than its factorization.

5181381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191912 (or 191906 counting only the distinct ones).

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

The square root of 5181381 is about 2276.2647034121. The cubic root of 5181381 is about 173.0407980673.

The spelling of 5181381 in words is "five million, one hundred eighty-one thousand, three hundred eighty-one".