641813397 has 8 divisors (see below), whose sum is σ = 856861344. Its totient is φ = 427320528.

The previous prime is 641813383. The next prime is 641813437. The reversal of 641813397 is 793318146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641813397 - 2²⁰ = 640764821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641813357) 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 in 7 ways as a sum of consecutive naturals, for example, 136063 + ... + 140700.

It is an arithmetic number, because the mean of its divisors is an integer number (107107668).

Almost surely, 2^641813397 is an apocalyptic number.

It is an amenable number.

641813397 is a deficient number, since it is larger than the sum of its proper divisors (215047947).

641813397 is a wasteful number, since it uses less digits than its factorization.

641813397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277539.

The product of its digits is 108864, while the sum is 42.

The square root of 641813397 is about 25334.0363345441. The cubic root of 641813397 is about 862.5870346113.

The spelling of 641813397 in words is "six hundred forty-one million, eight hundred thirteen thousand, three hundred ninety-seven".