649738911 has 8 divisors (see below), whose sum is σ = 866566960. Its totient is φ = 433035072.

The previous prime is 649738871. The next prime is 649738913. The reversal of 649738911 is 119837946.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649738911 - 2⁶ = 649738847 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 (649738913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18070 + ... + 40323.

It is an arithmetic number, because the mean of its divisors is an integer number (108320870).

Almost surely, 2^649738911 is an apocalyptic number.

649738911 is a deficient number, since it is larger than the sum of its proper divisors (216828049).

649738911 is a wasteful number, since it uses less digits than its factorization.

649738911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62105.

The product of its digits is 326592, while the sum is 48.

The square root of 649738911 is about 25489.9766771176. The cubic root of 649738911 is about 866.1231074998.

The spelling of 649738911 in words is "six hundred forty-nine million, seven hundred thirty-eight thousand, nine hundred eleven".