5181389 has 4 divisors (see below), whose sum is σ = 5227356. Its totient is φ = 5135424.

The previous prime is 5181383. The next prime is 5181391. The reversal of 5181389 is 9831815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2402500 + 2778889 = 1550^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 5181389 - 2⁸ = 5181133 is a prime.

It is a Duffinian 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22814 + ... + 23039.

It is an arithmetic number, because the mean of its divisors is an integer number (1306839).

Almost surely, 2^5181389 is an apocalyptic number.

It is an amenable number.

5181389 is a deficient number, since it is larger than the sum of its proper divisors (45967).

5181389 is a wasteful number, since it uses less digits than its factorization.

5181389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45966.

The product of its digits is 8640, while the sum is 35.

The square root of 5181389 is about 2276.2664606763. The cubic root of 5181389 is about 173.0408871250.

The spelling of 5181389 in words is "five million, one hundred eighty-one thousand, three hundred eighty-nine".