517421789 has 2 divisors, whose sum is σ = 517421790. Its totient is φ = 517421788.

The previous prime is 517421761. The next prime is 517421831. The reversal of 517421789 is 987124715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 285103225 + 232318564 = 16885^2 + 15242^2 .

It is a cyclic number.

It is not a de Polignac number, because 517421789 - 2⁸ = 517421533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (517421759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258710894 + 258710895.

It is an arithmetic number, because the mean of its divisors is an integer number (258710895).

Almost surely, 2^517421789 is an apocalyptic number.

It is an amenable number.

517421789 is a deficient number, since it is larger than the sum of its proper divisors (1).

517421789 is an equidigital number, since it uses as much as digits as its factorization.

517421789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 44.

The square root of 517421789 is about 22746.9072403261. The cubic root of 517421789 is about 802.8139390166.

The spelling of 517421789 in words is "five hundred seventeen million, four hundred twenty-one thousand, seven hundred eighty-nine".