648949 has 4 divisors (see below), whose sum is σ = 741664. Its totient is φ = 556236.

The previous prime is 648937. The next prime is 648953. The reversal of 648949 is 949846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 949846 = 2 ⋅474923.

It is a cyclic number.

It is not a de Polignac number, because 648949 - 2⁵ = 648917 is a prime.

It is a super-2 number, since 2×648949² = 842269609202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648449) 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 in 3 ways as a sum of consecutive naturals, for example, 46347 + ... + 46360.

It is an arithmetic number, because the mean of its divisors is an integer number (185416).

2⁶⁴⁸⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

648949 is a deficient number, since it is larger than the sum of its proper divisors (92715).

648949 is an equidigital number, since it uses as much as digits as its factorization.

648949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92714.

The product of its digits is 62208, while the sum is 40.

The square root of 648949 is about 805.5737086077. The cubic root of 648949 is about 86.5771972811.

The spelling of 648949 in words is "six hundred forty-eight thousand, nine hundred forty-nine".