647930651 has 2 divisors, whose sum is σ = 647930652. Its totient is φ = 647930650.

The previous prime is 647930641. The next prime is 647930653. The reversal of 647930651 is 156039746.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647930651 is a prime.

Together with 647930653, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647930599 and 647930608.

It is not a weakly prime, because it can be changed into another prime (647930653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323965325 + 323965326.

It is an arithmetic number, because the mean of its divisors is an integer number (323965326).

Almost surely, 2^647930651 is an apocalyptic number.

647930651 is a deficient number, since it is larger than the sum of its proper divisors (1).

647930651 is an equidigital number, since it uses as much as digits as its factorization.

647930651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 647930651 is about 25454.4819432649. The cubic root of 647930651 is about 865.3188711555.

The spelling of 647930651 in words is "six hundred forty-seven million, nine hundred thirty thousand, six hundred fifty-one".