517247891 has 2 divisors, whose sum is σ = 517247892. Its totient is φ = 517247890.

The previous prime is 517247813. The next prime is 517247911. The reversal of 517247891 is 198742715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 517247891 - 2¹⁰ = 517246867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (517247791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258623945 + 258623946.

It is an arithmetic number, because the mean of its divisors is an integer number (258623946).

Almost surely, 2^517247891 is an apocalyptic number.

517247891 is a deficient number, since it is larger than the sum of its proper divisors (1).

517247891 is an equidigital number, since it uses as much as digits as its factorization.

517247891 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 517247891 is about 22743.0844653930. The cubic root of 517247891 is about 802.7239908774.

The spelling of 517247891 in words is "five hundred seventeen million, two hundred forty-seven thousand, eight hundred ninety-one".