649004519 has 4 divisors (see below), whose sum is σ = 649214544. Its totient is φ = 648794496.

The previous prime is 649004509. The next prime is 649004537. The reversal of 649004519 is 915400946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 915400946 = 2 ⋅457700473.

It is a cyclic number.

It is not a de Polignac number, because 649004519 - 2⁸ = 649004263 is a prime.

It is a super-2 number, since 2×649004519² = 842413731364842722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649004509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100307 + ... + 106580.

It is an arithmetic number, because the mean of its divisors is an integer number (162303636).

Almost surely, 2^649004519 is an apocalyptic number.

649004519 is a deficient number, since it is larger than the sum of its proper divisors (210025).

649004519 is a wasteful number, since it uses less digits than its factorization.

649004519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210024.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 649004519 is about 25475.5670986928. The cubic root of 649004519 is about 865.7966616665.

The spelling of 649004519 in words is "six hundred forty-nine million, four thousand, five hundred nineteen".