518413949 has 2 divisors, whose sum is σ = 518413950. Its totient is φ = 518413948.

The previous prime is 518413939. The next prime is 518413957. The reversal of 518413949 is 949314815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 517881049 + 532900 = 22757^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518413949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518413939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259206974 + 259206975.

It is an arithmetic number, because the mean of its divisors is an integer number (259206975).

Almost surely, 2^518413949 is an apocalyptic number.

It is an amenable number.

518413949 is a deficient number, since it is larger than the sum of its proper divisors (1).

518413949 is an equidigital number, since it uses as much as digits as its factorization.

518413949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 518413949 is about 22768.7054748398. The cubic root of 518413949 is about 803.3267452193.

The spelling of 518413949 in words is "five hundred eighteen million, four hundred thirteen thousand, nine hundred forty-nine".