641329397 has 4 divisors (see below), whose sum is σ = 647556000. Its totient is φ = 635102796.

The previous prime is 641329373. The next prime is 641329411. The reversal of 641329397 is 793923146.

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 641329397 - 2¹⁸ = 641067253 is a prime.

It is a super-2 number, since 2×641329397² = 822606790912767218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641329307) 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 3 ways as a sum of consecutive naturals, for example, 3113147 + ... + 3113352.

It is an arithmetic number, because the mean of its divisors is an integer number (161889000).

Almost surely, 2^641329397 is an apocalyptic number.

It is an amenable number.

641329397 is a deficient number, since it is larger than the sum of its proper divisors (6226603).

641329397 is a wasteful number, since it uses less digits than its factorization.

641329397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226602.

The product of its digits is 244944, while the sum is 44.

The square root of 641329397 is about 25324.4821664728. The cubic root of 641329397 is about 862.3701506405.

The spelling of 641329397 in words is "six hundred forty-one million, three hundred twenty-nine thousand, three hundred ninety-seven".