647125331 has 2 divisors, whose sum is σ = 647125332. Its totient is φ = 647125330.

The previous prime is 647125289. The next prime is 647125337. The reversal of 647125331 is 133521746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647125331 - 2¹⁰ = 647124307 is a prime.

It is a super-2 number, since 2×647125331² = 837542388043719122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647125337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323562665 + 323562666.

It is an arithmetic number, because the mean of its divisors is an integer number (323562666).

Almost surely, 2^647125331 is an apocalyptic number.

647125331 is a deficient number, since it is larger than the sum of its proper divisors (1).

647125331 is an equidigital number, since it uses as much as digits as its factorization.

647125331 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 647125331 is about 25438.6581996771. The cubic root of 647125331 is about 864.9602178013.

The spelling of 647125331 in words is "six hundred forty-seven million, one hundred twenty-five thousand, three hundred thirty-one".