649012905 has 24 divisors (see below), whose sum is σ = 1166622912. Its totient is φ = 346139568.

The previous prime is 649012891. The next prime is 649012909. The reversal of 649012905 is 509210946.

649012905 is a `hidden beast` number, since 649 + 0 + 1 + 2 + 9 + 0 + 5 = 666.

It is not a de Polignac number, because 649012905 - 2⁸ = 649012649 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 649012905.

It is not an unprimeable number, because it can be changed into a prime (649012909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265869 + ... + 268298.

It is an arithmetic number, because the mean of its divisors is an integer number (48609288).

Almost surely, 2^649012905 is an apocalyptic number.

It is an amenable number.

649012905 is a deficient number, since it is larger than the sum of its proper divisors (517610007).

649012905 is an equidigital number, since it uses as much as digits as its factorization.

649012905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534187 (or 534175 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 649012905 is about 25475.7316872352. The cubic root of 649012905 is about 865.8003907312.

The spelling of 649012905 in words is "six hundred forty-nine million, twelve thousand, nine hundred five".