518661641 has 2 divisors, whose sum is σ = 518661642. Its totient is φ = 518661640.

The previous prime is 518661617. The next prime is 518661691. The reversal of 518661641 is 146166815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515108416 + 3553225 = 22696^2 + 1885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518661641 is a prime.

It is a Chen prime.

It is equal to p_27285950 and since 518661641 and 27285950 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 518661595 and 518661604.

It is not a weakly prime, because it can be changed into another prime (518661691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259330820 + 259330821.

It is an arithmetic number, because the mean of its divisors is an integer number (259330821).

Almost surely, 2^518661641 is an apocalyptic number.

It is an amenable number.

518661641 is a deficient number, since it is larger than the sum of its proper divisors (1).

518661641 is an equidigital number, since it uses as much as digits as its factorization.

518661641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 518661641 is about 22774.1441332051. The cubic root of 518661641 is about 803.4546648270.

The spelling of 518661641 in words is "five hundred eighteen million, six hundred sixty-one thousand, six hundred forty-one".