641393421 has 4 divisors (see below), whose sum is σ = 855191232. Its totient is φ = 427595612.

The previous prime is 641393413. The next prime is 641393429. The reversal of 641393421 is 124393146.

641393421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (641393413) and next prime (641393429).

It is a cyclic number.

It is not a de Polignac number, because 641393421 - 2³ = 641393413 is a prime.

It is a super-2 number, since 2×641393421² = 822771041004166482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641393429) 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, 106898901 + ... + 106898906.

It is an arithmetic number, because the mean of its divisors is an integer number (213797808).

Almost surely, 2^641393421 is an apocalyptic number.

It is an amenable number.

641393421 is a deficient number, since it is larger than the sum of its proper divisors (213797811).

641393421 is a wasteful number, since it uses less digits than its factorization.

641393421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213797810.

The product of its digits is 15552, while the sum is 33.

The square root of 641393421 is about 25325.7462081574. The cubic root of 641393421 is about 862.3988465283.

The spelling of 641393421 in words is "six hundred forty-one million, three hundred ninety-three thousand, four hundred twenty-one".