648447929 has 2 divisors, whose sum is σ = 648447930. Its totient is φ = 648447928.

The previous prime is 648447893. The next prime is 648447931. The reversal of 648447929 is 929744846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 593019904 + 55428025 = 24352^2 + 7445^2 .

It is a cyclic number.

It is not a de Polignac number, because 648447929 - 2¹⁶ = 648382393 is a prime.

Together with 648447931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648447329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324223964 + 324223965.

It is an arithmetic number, because the mean of its divisors is an integer number (324223965).

Almost surely, 2^648447929 is an apocalyptic number.

It is an amenable number.

648447929 is a deficient number, since it is larger than the sum of its proper divisors (1).

648447929 is an equidigital number, since it uses as much as digits as its factorization.

648447929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 53.

The square root of 648447929 is about 25464.6407592960. The cubic root of 648447929 is about 865.5490868172.

The spelling of 648447929 in words is "six hundred forty-eight million, four hundred forty-seven thousand, nine hundred twenty-nine".