649518445 has 16 divisors (see below), whose sum is σ = 795478320. Its totient is φ = 508944384.

The previous prime is 649518431. The next prime is 649518469. The reversal of 649518445 is 544815946.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 146458404 + 503060041 = 12102^2 + 22429^2 .

It is a cyclic number.

It is not a de Polignac number, because 649518445 - 2⁹ = 649517933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649518395 and 649518404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186157 + ... + 189613.

It is an arithmetic number, because the mean of its divisors is an integer number (49717395).

Almost surely, 2^649518445 is an apocalyptic number.

It is an amenable number.

649518445 is a deficient number, since it is larger than the sum of its proper divisors (145959875).

649518445 is a wasteful number, since it uses less digits than its factorization.

649518445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224.

The product of its digits is 691200, while the sum is 46.

The square root of 649518445 is about 25485.6517476010. The cubic root of 649518445 is about 866.0251336340.

The spelling of 649518445 in words is "six hundred forty-nine million, five hundred eighteen thousand, four hundred forty-five".