641213500 has 24 divisors (see below), whose sum is σ = 1400411376. Its totient is φ = 256485200.

The previous prime is 641213479. The next prime is 641213509. The reversal of 641213500 is 5312146.

It is a super-2 number, since 2×641213500² = 822309505164500000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641213509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640714 + ... + 641713.

It is an arithmetic number, because the mean of its divisors is an integer number (58350474).

Almost surely, 2^641213500 is an apocalyptic number.

It is an amenable number.

641213500 is an abundant number, since it is smaller than the sum of its proper divisors (759197876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641213500 is a wasteful number, since it uses less digits than its factorization.

641213500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282446 (or 1282434 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 641213500 is about 25322.1938228109. The cubic root of 641213500 is about 862.3182001478.

Adding to 641213500 its reverse (5312146), we get a palindrome (646525646).

The spelling of 641213500 in words is "six hundred forty-one million, two hundred thirteen thousand, five hundred".