5181231 has 8 divisors (see below), whose sum is σ = 7536384. Its totient is φ = 3140120.

The previous prime is 5181223. The next prime is 5181251. The reversal of 5181231 is 1321815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5181231 - 2³ = 5181223 is a prime.

It is a super-2 number, since 2×5181231² = 53690309350722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5181198 and 5181207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78471 + ... + 78536.

It is an arithmetic number, because the mean of its divisors is an integer number (942048).

Almost surely, 2^5181231 is an apocalyptic number.

5181231 is a deficient number, since it is larger than the sum of its proper divisors (2355153).

5181231 is a wasteful number, since it uses less digits than its factorization.

5181231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157021.

The product of its digits is 240, while the sum is 21.

The square root of 5181231 is about 2276.2317544574. The cubic root of 5181231 is about 173.0391282184.

The spelling of 5181231 in words is "five million, one hundred eighty-one thousand, two hundred thirty-one".