640601211 has 16 divisors (see below), whose sum is σ = 874888704. Its totient is φ = 416744544.

The previous prime is 640601209. The next prime is 640601237. The reversal of 640601211 is 112106046.

It is not a de Polignac number, because 640601211 - 2¹ = 640601209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640601201) 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 15 ways as a sum of consecutive naturals, for example, 42381 + ... + 55473.

It is an arithmetic number, because the mean of its divisors is an integer number (54680544).

Almost surely, 2^640601211 is an apocalyptic number.

640601211 is a deficient number, since it is larger than the sum of its proper divisors (234287493).

640601211 is a wasteful number, since it uses less digits than its factorization.

640601211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13490.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 640601211 is about 25310.1009677954. The cubic root of 640601211 is about 862.0436394413.

Multiplying 640601211 by its sum of digits (21), we get a palindrome (13452625431).

Adding to 640601211 its reverse (112106046), we get a palindrome (752707257).

The spelling of 640601211 in words is "six hundred forty million, six hundred one thousand, two hundred eleven".