649121089 has 4 divisors (see below), whose sum is σ = 662932224. Its totient is φ = 635309956.

The previous prime is 649121087. The next prime is 649121119. The reversal of 649121089 is 980121946.

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, and also an emirpimes, since its reverse is a distinct semiprime: 980121946 = 2 ⋅490060973.

It is a cyclic number.

It is not a de Polignac number, because 649121089 - 2¹ = 649121087 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649121087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6905497 + ... + 6905590.

It is an arithmetic number, because the mean of its divisors is an integer number (165733056).

Almost surely, 2^649121089 is an apocalyptic number.

It is an amenable number.

649121089 is a deficient number, since it is larger than the sum of its proper divisors (13811135).

649121089 is a wasteful number, since it uses less digits than its factorization.

649121089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13811134.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 649121089 is about 25477.8548743806. The cubic root of 649121089 is about 865.8484948315.

The spelling of 649121089 in words is "six hundred forty-nine million, one hundred twenty-one thousand, eighty-nine".