513661111 has 2 divisors, whose sum is σ = 513661112. Its totient is φ = 513661110.

The previous prime is 513661063. The next prime is 513661153. The reversal of 513661111 is 111166315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513661111 - 2⁹ = 513660599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513361111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256830555 + 256830556.

It is an arithmetic number, because the mean of its divisors is an integer number (256830556).

Almost surely, 2^513661111 is an apocalyptic number.

513661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

513661111 is an equidigital number, since it uses as much as digits as its factorization.

513661111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 25.

The square root of 513661111 is about 22664.0929886903. The cubic root of 513661111 is about 800.8642280304.

The spelling of 513661111 in words is "five hundred thirteen million, six hundred sixty-one thousand, one hundred eleven".