649995249 has 16 divisors (see below), whose sum is σ = 907564032. Its totient is φ = 413012688.

The previous prime is 649995239. The next prime is 649995337. The reversal of 649995249 is 942599946.

It is not a de Polignac number, because 649995249 - 2¹³ = 649987057 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649995239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2884 + ... + 36170.

It is an arithmetic number, because the mean of its divisors is an integer number (56722752).

Almost surely, 2^649995249 is an apocalyptic number.

649995249 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

649995249 is a deficient number, since it is larger than the sum of its proper divisors (257568783).

649995249 is a wasteful number, since it uses less digits than its factorization.

649995249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33596.

The product of its digits is 6298560, while the sum is 57.

The square root of 649995249 is about 25495.0043930179. The cubic root of 649995249 is about 866.2369948219.

The spelling of 649995249 in words is "six hundred forty-nine million, nine hundred ninety-five thousand, two hundred forty-nine".