513631247 has 2 divisors, whose sum is σ = 513631248. Its totient is φ = 513631246.

The previous prime is 513631243. The next prime is 513631273. The reversal of 513631247 is 742136315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 513631247 - 2² = 513631243 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513631243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256815623 + 256815624.

It is an arithmetic number, because the mean of its divisors is an integer number (256815624).

Almost surely, 2^513631247 is an apocalyptic number.

513631247 is a deficient number, since it is larger than the sum of its proper divisors (1).

513631247 is an equidigital number, since it uses as much as digits as its factorization.

513631247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 513631247 is about 22663.4341396003. The cubic root of 513631247 is about 800.8487071144.

The spelling of 513631247 in words is "five hundred thirteen million, six hundred thirty-one thousand, two hundred forty-seven".