641641431 has 32 divisors (see below), whose sum is σ = 891717120. Its totient is φ = 410112000.

The previous prime is 641641417. The next prime is 641641439. The reversal of 641641431 is 134146146.

It is not a de Polignac number, because 641641431 - 2²² = 637447127 is a prime.

It is a super-2 number, since 2×641641431² = 823407451951455522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641641439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3324471 + ... + 3324663.

It is an arithmetic number, because the mean of its divisors is an integer number (27866160).

Almost surely, 2^641641431 is an apocalyptic number.

641641431 is a deficient number, since it is larger than the sum of its proper divisors (250075689).

641641431 is a wasteful number, since it uses less digits than its factorization.

641641431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567.

The product of its digits is 6912, while the sum is 30.

The square root of 641641431 is about 25330.6421355638. The cubic root of 641641431 is about 862.5099878701.

Adding to 641641431 its reverse (134146146), we get a palindrome (775787577).

The spelling of 641641431 in words is "six hundred forty-one million, six hundred forty-one thousand, four hundred thirty-one".