641051421 has 4 divisors (see below), whose sum is σ = 854735232. Its totient is φ = 427367612.

The previous prime is 641051407. The next prime is 641051429. The reversal of 641051421 is 124150146.

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 641051421 - 2¹³ = 641043229 is a prime.

It is a super-2 number, since 2×641051421² = 821893848732238482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641051391 and 641051400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641051429) 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, 106841901 + ... + 106841906.

It is an arithmetic number, because the mean of its divisors is an integer number (213683808).

Almost surely, 2^641051421 is an apocalyptic number.

It is an amenable number.

641051421 is a deficient number, since it is larger than the sum of its proper divisors (213683811).

641051421 is a wasteful number, since it uses less digits than its factorization.

641051421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213683810.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 641051421 is about 25318.9932856739. The cubic root of 641051421 is about 862.2455382085.

The spelling of 641051421 in words is "six hundred forty-one million, fifty-one thousand, four hundred twenty-one".