648416731 has 2 divisors, whose sum is σ = 648416732. Its totient is φ = 648416730.

The previous prime is 648416729. The next prime is 648416761. The reversal of 648416731 is 137614846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648416731 - 2¹ = 648416729 is a prime.

It is a super-2 number, since 2×648416731² = 840888514081452722, which contains 22 as substring.

Together with 648416729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (648416761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324208365 + 324208366.

It is an arithmetic number, because the mean of its divisors is an integer number (324208366).

Almost surely, 2^648416731 is an apocalyptic number.

648416731 is a deficient number, since it is larger than the sum of its proper divisors (1).

648416731 is an equidigital number, since it uses as much as digits as its factorization.

648416731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 648416731 is about 25464.0281770187. The cubic root of 648416731 is about 865.5352055518.

The spelling of 648416731 in words is "six hundred forty-eight million, four hundred sixteen thousand, seven hundred thirty-one".