513657247 has 2 divisors, whose sum is σ = 513657248. Its totient is φ = 513657246.

The previous prime is 513657233. The next prime is 513657253. The reversal of 513657247 is 742756315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513657247 - 2⁷ = 513657119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513657047) 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, 256828623 + 256828624.

It is an arithmetic number, because the mean of its divisors is an integer number (256828624).

Almost surely, 2^513657247 is an apocalyptic number.

513657247 is a deficient number, since it is larger than the sum of its proper divisors (1).

513657247 is an equidigital number, since it uses as much as digits as its factorization.

513657247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 40.

The square root of 513657247 is about 22664.0077435567. The cubic root of 513657247 is about 800.8622198664.

The spelling of 513657247 in words is "five hundred thirteen million, six hundred fifty-seven thousand, two hundred forty-seven".