648949539 has 16 divisors (see below), whose sum is σ = 1009916928. Its totient is φ = 362937792.

The previous prime is 648949513. The next prime is 648949571. The reversal of 648949539 is 935949846.

It is a happy number.

It is not a de Polignac number, because 648949539 - 2⁸ = 648949283 is a prime.

It is a super-2 number, since 2×648949539² = 842271008336625042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648949339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327762 + ... + 329735.

It is an arithmetic number, because the mean of its divisors is an integer number (63119808).

Almost surely, 2^648949539 is an apocalyptic number.

648949539 is a deficient number, since it is larger than the sum of its proper divisors (360967389).

648949539 is a wasteful number, since it uses less digits than its factorization.

648949539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657554.

The product of its digits is 8398080, while the sum is 57.

The square root of 648949539 is about 25474.4880027058. The cubic root of 648949539 is about 865.7722125071.

The spelling of 648949539 in words is "six hundred forty-eight million, nine hundred forty-nine thousand, five hundred thirty-nine".