513999979 has 2 divisors, whose sum is σ = 513999980. Its totient is φ = 513999978.

The previous prime is 513999977. The next prime is 514000001. The reversal of 513999979 is 979999315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 513999979 - 2¹ = 513999977 is a prime.

Together with 513999977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (513999971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256999989 + 256999990.

It is an arithmetic number, because the mean of its divisors is an integer number (256999990).

Almost surely, 2^513999979 is an apocalyptic number.

513999979 is a deficient number, since it is larger than the sum of its proper divisors (1).

513999979 is an equidigital number, since it uses as much as digits as its factorization.

513999979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6200145, while the sum is 61.

The square root of 513999979 is about 22671.5676343741. The cubic root of 513999979 is about 801.0403023565.

The spelling of 513999979 in words is "five hundred thirteen million, nine hundred ninety-nine thousand, nine hundred seventy-nine".