641333913 has 16 divisors (see below), whose sum is σ = 958063296. Its totient is φ = 378181440.

The previous prime is 641333899. The next prime is 641333933. The reversal of 641333913 is 319333146.

It is not a de Polignac number, because 641333913 - 2⁴ = 641333897 is a prime.

It is a super-2 number, since 2×641333913² = 822618375927783138, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (641333933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261406 + ... + 263847.

It is an arithmetic number, because the mean of its divisors is an integer number (59878956).

Almost surely, 2^641333913 is an apocalyptic number.

It is an amenable number.

641333913 is a deficient number, since it is larger than the sum of its proper divisors (316729383).

641333913 is a wasteful number, since it uses less digits than its factorization.

641333913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525304.

The product of its digits is 17496, while the sum is 33.

The square root of 641333913 is about 25324.5713290472. The cubic root of 641333913 is about 862.3721747977.

It can be divided in two parts, 641333 and 913, that added together give a palindrome (642246).

The spelling of 641333913 in words is "six hundred forty-one million, three hundred thirty-three thousand, nine hundred thirteen".