649235189 has 4 divisors (see below), whose sum is σ = 666782124. Its totient is φ = 631688256.

The previous prime is 649235183. The next prime is 649235231. The reversal of 649235189 is 981532946.

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

It can be written as a sum of positive squares in 2 ways, for example, as 456164164 + 193071025 = 21358^2 + 13895^2 .

It is a cyclic number.

It is not a de Polignac number, because 649235189 - 2⁸ = 649234933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649235183) 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, 8773412 + ... + 8773485.

It is an arithmetic number, because the mean of its divisors is an integer number (166695531).

Almost surely, 2^649235189 is an apocalyptic number.

It is an amenable number.

649235189 is a deficient number, since it is larger than the sum of its proper divisors (17546935).

649235189 is a wasteful number, since it uses less digits than its factorization.

649235189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17546934.

The product of its digits is 466560, while the sum is 47.

The square root of 649235189 is about 25480.0939754939. The cubic root of 649235189 is about 865.8992236949.

The spelling of 649235189 in words is "six hundred forty-nine million, two hundred thirty-five thousand, one hundred eighty-nine".