649964129 has 4 divisors (see below), whose sum is σ = 652081584. Its totient is φ = 647846676.

The previous prime is 649964123. The next prime is 649964177. The reversal of 649964129 is 921469946.

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 649964129 - 2¹² = 649960033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649964123) 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, 1058267 + ... + 1058880.

It is an arithmetic number, because the mean of its divisors is an integer number (163020396).

Almost surely, 2^649964129 is an apocalyptic number.

It is an amenable number.

649964129 is a deficient number, since it is larger than the sum of its proper divisors (2117455).

649964129 is a wasteful number, since it uses less digits than its factorization.

649964129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117454.

The product of its digits is 839808, while the sum is 50.

The square root of 649964129 is about 25494.3940700696. The cubic root of 649964129 is about 866.2231702463.

The spelling of 649964129 in words is "six hundred forty-nine million, nine hundred sixty-four thousand, one hundred twenty-nine".