649867493 has 4 divisors (see below), whose sum is σ = 708946368. Its totient is φ = 590788620.

The previous prime is 649867489. The next prime is 649867513. The reversal of 649867493 is 394768946.

649867493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 649867493 - 2² = 649867489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649867793) 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, 29539421 + ... + 29539442.

It is an arithmetic number, because the mean of its divisors is an integer number (177236592).

Almost surely, 2^649867493 is an apocalyptic number.

It is an amenable number.

649867493 is a deficient number, since it is larger than the sum of its proper divisors (59078875).

649867493 is a wasteful number, since it uses less digits than its factorization.

649867493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59078874.

The product of its digits is 7838208, while the sum is 56.

The square root of 649867493 is about 25492.4987594390. The cubic root of 649867493 is about 866.1802383944.

The spelling of 649867493 in words is "six hundred forty-nine million, eight hundred sixty-seven thousand, four hundred ninety-three".