649019001 has 4 divisors (see below), whose sum is σ = 865358672. Its totient is φ = 432679332.

The previous prime is 649018999. The next prime is 649019051. The reversal of 649019001 is 100910946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 649019001 - 2¹ = 649018999 is a prime.

It is a Duffinian number.

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 649019001.

It is not an unprimeable number, because it can be changed into a prime (649019051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108169831 + ... + 108169836.

It is an arithmetic number, because the mean of its divisors is an integer number (216339668).

Almost surely, 2^649019001 is an apocalyptic number.

It is an amenable number.

649019001 is a deficient number, since it is larger than the sum of its proper divisors (216339671).

649019001 is a wasteful number, since it uses less digits than its factorization.

649019001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216339670.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 649019001 is about 25475.8513302304. The cubic root of 649019001 is about 865.8031014645.

Adding to 649019001 its reverse (100910946), we get a palindrome (749929947).

The spelling of 649019001 in words is "six hundred forty-nine million, nineteen thousand, one".