647344631 has 2 divisors, whose sum is σ = 647344632. Its totient is φ = 647344630.

The previous prime is 647344619. The next prime is 647344741. The reversal of 647344631 is 136443746.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647344631 - 2¹⁰ = 647343607 is a prime.

It is a super-2 number, since 2×647344631² = 838110142569052322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647344031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323672315 + 323672316.

It is an arithmetic number, because the mean of its divisors is an integer number (323672316).

Almost surely, 2^647344631 is an apocalyptic number.

647344631 is a deficient number, since it is larger than the sum of its proper divisors (1).

647344631 is an equidigital number, since it uses as much as digits as its factorization.

647344631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 38.

The square root of 647344631 is about 25442.9682034153. The cubic root of 647344631 is about 865.0579136384.

The spelling of 647344631 in words is "six hundred forty-seven million, three hundred forty-four thousand, six hundred thirty-one".