640611001 has 8 divisors (see below), whose sum is σ = 662649344. Its totient is φ = 618658560.

The previous prime is 640610977. The next prime is 640611043. The reversal of 640611001 is 100116046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640611001 - 2¹¹ = 640608953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640611001.

It is not an unprimeable number, because it can be changed into a prime (640611401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6120 + ... + 36313.

It is an arithmetic number, because the mean of its divisors is an integer number (82831168).

Almost surely, 2^640611001 is an apocalyptic number.

It is an amenable number.

640611001 is a deficient number, since it is larger than the sum of its proper divisors (22038343).

640611001 is a wasteful number, since it uses less digits than its factorization.

640611001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42951.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 640611001 is about 25310.2943681025. The cubic root of 640611001 is about 862.0480308183.

Adding to 640611001 its reverse (100116046), we get a palindrome (740727047).

The spelling of 640611001 in words is "six hundred forty million, six hundred eleven thousand, one".