641523812 has 6 divisors (see below), whose sum is σ = 1122666678. Its totient is φ = 320761904.

The previous prime is 641523811. The next prime is 641523833. The reversal of 641523812 is 218325146.

It can be written as a sum of positive squares in only one way, i.e., 591170596 + 50353216 = 24314^2 + 7096^2 .

It is a super-2 number, since 2×641523812² = 823105602726022688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641523811) 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 as a sum of consecutive naturals, namely, 80190473 + ... + 80190480.

It is an arithmetic number, because the mean of its divisors is an integer number (187111113).

Almost surely, 2^641523812 is an apocalyptic number.

It is an amenable number.

641523812 is a deficient number, since it is larger than the sum of its proper divisors (481142866).

641523812 is a wasteful number, since it uses less digits than its factorization.

641523812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160380957 (or 160380955 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 641523812 is about 25328.3203548913. The cubic root of 641523812 is about 862.4572825444.

Adding to 641523812 its reverse (218325146), we get a palindrome (859848958).

The spelling of 641523812 in words is "six hundred forty-one million, five hundred twenty-three thousand, eight hundred twelve".