518961947 has 4 divisors (see below), whose sum is σ = 593099376. Its totient is φ = 444824520.

The previous prime is 518961943. The next prime is 518962007. The reversal of 518961947 is 749169815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749169815 = 5 ⋅149833963.

It is not a de Polignac number, because 518961947 - 2² = 518961943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 518961895 and 518961904.

It is not an unprimeable number, because it can be changed into a prime (518961943) 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, 37068704 + ... + 37068717.

It is an arithmetic number, because the mean of its divisors is an integer number (148274844).

Almost surely, 2^518961947 is an apocalyptic number.

518961947 is a deficient number, since it is larger than the sum of its proper divisors (74137429).

518961947 is an equidigital number, since it uses as much as digits as its factorization.

518961947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74137428.

The product of its digits is 544320, while the sum is 50.

The square root of 518961947 is about 22780.7363138245. The cubic root of 518961947 is about 803.6097021287.

The spelling of 518961947 in words is "five hundred eighteen million, nine hundred sixty-one thousand, nine hundred forty-seven".