649913649 has 16 divisors (see below), whose sum is σ = 1080376320. Its totient is φ = 337617360.

The previous prime is 649913647. The next prime is 649913659. The reversal of 649913649 is 946319946.

It is not a de Polignac number, because 649913649 - 2¹ = 649913647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649913647) 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, 1406509 + ... + 1406970.

It is an arithmetic number, because the mean of its divisors is an integer number (67523520).

Almost surely, 2^649913649 is an apocalyptic number.

It is an amenable number.

649913649 is a deficient number, since it is larger than the sum of its proper divisors (430462671).

649913649 is a wasteful number, since it uses less digits than its factorization.

649913649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813500.

The product of its digits is 1259712, while the sum is 51.

The square root of 649913649 is about 25493.4040292778. The cubic root of 649913649 is about 866.2007443534.

The spelling of 649913649 in words is "six hundred forty-nine million, nine hundred thirteen thousand, six hundred forty-nine".