641331321 has 4 divisors (see below), whose sum is σ = 855108432. Its totient is φ = 427554212.

The previous prime is 641331281. The next prime is 641331343. The reversal of 641331321 is 123133146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641331321 - 2¹⁴ = 641314937 is a prime.

It is a super-2 number, since 2×641331321² = 822611726591210082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641331291 and 641331300.

It is not an unprimeable number, because it can be changed into a prime (641331391) 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, 106888551 + ... + 106888556.

It is an arithmetic number, because the mean of its divisors is an integer number (213777108).

Almost surely, 2^641331321 is an apocalyptic number.

It is an amenable number.

641331321 is a deficient number, since it is larger than the sum of its proper divisors (213777111).

641331321 is a wasteful number, since it uses less digits than its factorization.

641331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213777110.

The product of its digits is 1296, while the sum is 24.

The square root of 641331321 is about 25324.5201534007. The cubic root of 641331321 is about 862.3710130151.

Adding to 641331321 its reverse (123133146), we get a palindrome (764464467).

The spelling of 641331321 in words is "six hundred forty-one million, three hundred thirty-one thousand, three hundred twenty-one".