648689471 has 2 divisors, whose sum is σ = 648689472. Its totient is φ = 648689470.

The previous prime is 648689453. The next prime is 648689479. The reversal of 648689471 is 174986846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648689471 - 2⁶ = 648689407 is a prime.

It is a super-3 number, since 3×648689471³ (a number of 27 digits) contains 333 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 (648689479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324344735 + 324344736.

It is an arithmetic number, because the mean of its divisors is an integer number (324344736).

Almost surely, 2^648689471 is an apocalyptic number.

648689471 is a deficient number, since it is larger than the sum of its proper divisors (1).

648689471 is an equidigital number, since it uses as much as digits as its factorization.

648689471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 53.

The square root of 648689471 is about 25469.3830117653. The cubic root of 648689471 is about 865.6565436615.

The spelling of 648689471 in words is "six hundred forty-eight million, six hundred eighty-nine thousand, four hundred seventy-one".