518125381 has 2 divisors, whose sum is σ = 518125382. Its totient is φ = 518125380.

The previous prime is 518125379. The next prime is 518125409. The reversal of 518125381 is 183521815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422672481 + 95452900 = 20559^2 + 9770^2 .

It is a cyclic number.

It is not a de Polignac number, because 518125381 - 2¹ = 518125379 is a prime.

It is a super-2 number, since 2×518125381² = 536907820872790322, which contains 22 as substring.

Together with 518125379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518125331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259062690 + 259062691.

It is an arithmetic number, because the mean of its divisors is an integer number (259062691).

Almost surely, 2^518125381 is an apocalyptic number.

It is an amenable number.

518125381 is a deficient number, since it is larger than the sum of its proper divisors (1).

518125381 is an equidigital number, since it uses as much as digits as its factorization.

518125381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 34.

The square root of 518125381 is about 22762.3676492583. The cubic root of 518125381 is about 803.1776639571.

The spelling of 518125381 in words is "five hundred eighteen million, one hundred twenty-five thousand, three hundred eighty-one".