648485381 has 2 divisors, whose sum is σ = 648485382. Its totient is φ = 648485380.

The previous prime is 648485351. The next prime is 648485407. The reversal of 648485381 is 183584846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636754756 + 11730625 = 25234^2 + 3425^2 .

It is a cyclic number.

It is not a de Polignac number, because 648485381 - 2²⁶ = 581376517 is a prime.

It is a super-2 number, since 2×648485381² = 841066578741430322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648485351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324242690 + 324242691.

It is an arithmetic number, because the mean of its divisors is an integer number (324242691).

Almost surely, 2^648485381 is an apocalyptic number.

It is an amenable number.

648485381 is a deficient number, since it is larger than the sum of its proper divisors (1).

648485381 is an equidigital number, since it uses as much as digits as its factorization.

648485381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 737280, while the sum is 47.

The square root of 648485381 is about 25465.3761213142. The cubic root of 648485381 is about 865.5657501549.

The spelling of 648485381 in words is "six hundred forty-eight million, four hundred eighty-five thousand, three hundred eighty-one".