649152209 has 4 divisors (see below), whose sum is σ = 664248816. Its totient is φ = 634055604.

The previous prime is 649152197. The next prime is 649152263. The reversal of 649152209 is 902251946.

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 649152209 - 2⁴ = 649152193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649152409) 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, 7548239 + ... + 7548324.

It is an arithmetic number, because the mean of its divisors is an integer number (166062204).

Almost surely, 2^649152209 is an apocalyptic number.

It is an amenable number.

649152209 is a deficient number, since it is larger than the sum of its proper divisors (15096607).

649152209 is a wasteful number, since it uses less digits than its factorization.

649152209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15096606.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 649152209 is about 25478.4655935164. The cubic root of 649152209 is about 865.8623313739.

The spelling of 649152209 in words is "six hundred forty-nine million, one hundred fifty-two thousand, two hundred nine".