649837933 has 4 divisors (see below), whose sum is σ = 663664320. Its totient is φ = 636011548.

The previous prime is 649837907. The next prime is 649837999. The reversal of 649837933 is 339738946.

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 649837933 - 2¹⁷ = 649706861 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 (649837633) 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, 6913123 + ... + 6913216.

It is an arithmetic number, because the mean of its divisors is an integer number (165916080).

Almost surely, 2^649837933 is an apocalyptic number.

It is an amenable number.

649837933 is a deficient number, since it is larger than the sum of its proper divisors (13826387).

649837933 is a wasteful number, since it uses less digits than its factorization.

649837933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13826386.

The product of its digits is 2939328, while the sum is 52.

The square root of 649837933 is about 25491.9189744515. The cubic root of 649837933 is about 866.1671051139.

The spelling of 649837933 in words is "six hundred forty-nine million, eight hundred thirty-seven thousand, nine hundred thirty-three".