649715109 has 16 divisors (see below), whose sum is σ = 911081472. Its totient is φ = 411043248.

The previous prime is 649715093. The next prime is 649715137. The reversal of 649715109 is 901517946.

It is not a de Polignac number, because 649715109 - 2⁴ = 649715093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649715149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28309 + ... + 45834.

It is an arithmetic number, because the mean of its divisors is an integer number (56942592).

Almost surely, 2^649715109 is an apocalyptic number.

649715109 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

649715109 is a deficient number, since it is larger than the sum of its proper divisors (261366363).

649715109 is a wasteful number, since it uses less digits than its factorization.

649715109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74296.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 649715109 is about 25489.5097834384. The cubic root of 649715109 is about 866.1125310905.

The spelling of 649715109 in words is "six hundred forty-nine million, seven hundred fifteen thousand, one hundred nine".