648619 has 2 divisors, whose sum is σ = 648620. Its totient is φ = 648618.

The previous prime is 648617. The next prime is 648629. The reversal of 648619 is 916846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648619 - 2¹ = 648617 is a prime.

It is a super-2 number, since 2×648619² = 841413214322, which contains 22 as substring.

Together with 648617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (648617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324309 + 324310.

It is an arithmetic number, because the mean of its divisors is an integer number (324310).

2⁶⁴⁸⁶¹⁹ is an apocalyptic number.

648619 is a deficient number, since it is larger than the sum of its proper divisors (1).

648619 is an equidigital number, since it uses as much as digits as its factorization.

648619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 648619 is about 805.3688595917. The cubic root of 648619 is about 86.5625195385.

The spelling of 648619 in words is "six hundred forty-eight thousand, six hundred nineteen".