649198983 has 4 divisors (see below), whose sum is σ = 865598648. Its totient is φ = 432799320.

The previous prime is 649198939. The next prime is 649198999. The reversal of 649198983 is 389891946.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 649198983 - 2⁶ = 649198919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649198933) 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, 108199828 + ... + 108199833.

It is an arithmetic number, because the mean of its divisors is an integer number (216399662).

Almost surely, 2^649198983 is an apocalyptic number.

649198983 is a deficient number, since it is larger than the sum of its proper divisors (216399665).

649198983 is a wasteful number, since it uses less digits than its factorization.

649198983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216399664.

The product of its digits is 3359232, while the sum is 57.

The square root of 649198983 is about 25479.3834894018. The cubic root of 649198983 is about 865.8831271501.

The spelling of 649198983 in words is "six hundred forty-nine million, one hundred ninety-eight thousand, nine hundred eighty-three".