649916493 has 4 divisors (see below), whose sum is σ = 866555328. Its totient is φ = 433277660.

The previous prime is 649916483. The next prime is 649916521. The reversal of 649916493 is 394619946.

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.

It is a cyclic number.

It is not a de Polignac number, because 649916493 - 2⁶ = 649916429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649916483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108319413 + ... + 108319418.

It is an arithmetic number, because the mean of its divisors is an integer number (216638832).

Almost surely, 2^649916493 is an apocalyptic number.

It is an amenable number.

649916493 is a deficient number, since it is larger than the sum of its proper divisors (216638835).

649916493 is a wasteful number, since it uses less digits than its factorization.

649916493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216638834.

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

The square root of 649916493 is about 25493.4598083508. The cubic root of 649916493 is about 866.2020078399.

The spelling of 649916493 in words is "six hundred forty-nine million, nine hundred sixteen thousand, four hundred ninety-three".