640102541 has 16 divisors (see below), whose sum is σ = 708288000. Its totient is φ = 578199024.

The previous prime is 640102531. The next prime is 640102543. The reversal of 640102541 is 145201046.

It is a de Polignac number, because none of the positive numbers 2^k-640102541 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 (640102543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100160 + ... + 106358.

It is an arithmetic number, because the mean of its divisors is an integer number (44268000).

Almost surely, 2^640102541 is an apocalyptic number.

It is an amenable number.

640102541 is a deficient number, since it is larger than the sum of its proper divisors (68185459).

640102541 is an equidigital number, since it uses as much as digits as its factorization.

640102541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6285 (or 6259 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 640102541 is about 25300.2478446358. The cubic root of 640102541 is about 861.8198981149.

Adding to 640102541 its reverse (145201046), we get a palindrome (785303587).

The spelling of 640102541 in words is "six hundred forty million, one hundred two thousand, five hundred forty-one".