649819641 has 16 divisors (see below), whose sum is σ = 904440128. Its totient is φ = 414590400.

The previous prime is 649819553. The next prime is 649819657. The reversal of 649819641 is 146918946.

It is not a de Polignac number, because 649819641 - 2⁹ = 649819129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649819691) 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, 41215 + ... + 54756.

It is an arithmetic number, because the mean of its divisors is an integer number (56527508).

Almost surely, 2^649819641 is an apocalyptic number.

649819641 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

649819641 is a deficient number, since it is larger than the sum of its proper divisors (254620487).

649819641 is a wasteful number, since it uses less digits than its factorization.

649819641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96072.

The product of its digits is 373248, while the sum is 48.

The square root of 649819641 is about 25491.5601915614. The cubic root of 649819641 is about 866.1589779197.

The spelling of 649819641 in words is "six hundred forty-nine million, eight hundred nineteen thousand, six hundred forty-one".