649872811 has 4 divisors (see below), whose sum is σ = 742711792. Its totient is φ = 557033832.

The previous prime is 649872799. The next prime is 649872829. The reversal of 649872811 is 118278946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649872811 - 2¹⁵ = 649840043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649842811) 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, 46419480 + ... + 46419493.

It is an arithmetic number, because the mean of its divisors is an integer number (185677948).

Almost surely, 2^649872811 is an apocalyptic number.

649872811 is a deficient number, since it is larger than the sum of its proper divisors (92838981).

649872811 is an equidigital number, since it uses as much as digits as its factorization.

649872811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92838980.

The product of its digits is 193536, while the sum is 46.

The square root of 649872811 is about 25492.6030644185. The cubic root of 649872811 is about 866.1826010985.

The spelling of 649872811 in words is "six hundred forty-nine million, eight hundred seventy-two thousand, eight hundred eleven".