641425243 has 4 divisors (see below), whose sum is σ = 643328920. Its totient is φ = 639521568.

The previous prime is 641425241. The next prime is 641425297. The reversal of 641425243 is 342524146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641425243 - 2¹ = 641425241 is a prime.

It is a super-2 number, since 2×641425243² = 822852684715218098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641425241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951333 + ... + 952006.

It is an arithmetic number, because the mean of its divisors is an integer number (160832230).

Almost surely, 2^641425243 is an apocalyptic number.

641425243 is a deficient number, since it is larger than the sum of its proper divisors (1903677).

641425243 is a wasteful number, since it uses less digits than its factorization.

641425243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903676.

The product of its digits is 23040, while the sum is 31.

The square root of 641425243 is about 25326.3744543115. The cubic root of 641425243 is about 862.4131086028.

Adding to 641425243 its reverse (342524146), we get a palindrome (983949389).

The spelling of 641425243 in words is "six hundred forty-one million, four hundred twenty-five thousand, two hundred forty-three".