641211503 has 4 divisors (see below), whose sum is σ = 669090288. Its totient is φ = 613332720.

The previous prime is 641211497. The next prime is 641211523. The reversal of 641211503 is 305112146.

641211503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 641211503 - 2⁸ = 641211247 is a prime.

It is a super-3 number, since 3×641211503³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 27878761 = 641211503 / (6 + 4 + 1 + 2 + 1 + 1 + 5 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641211523) 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, 13939358 + ... + 13939403.

It is an arithmetic number, because the mean of its divisors is an integer number (167272572).

Almost surely, 2^641211503 is an apocalyptic number.

641211503 is a deficient number, since it is larger than the sum of its proper divisors (27878785).

641211503 is a wasteful number, since it uses less digits than its factorization.

641211503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27878784.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 641211503 is about 25322.1543909676. The cubic root of 641211503 is about 862.3173049435.

Adding to 641211503 its reverse (305112146), we get a palindrome (946323649).

The spelling of 641211503 in words is "six hundred forty-one million, two hundred eleven thousand, five hundred three".