641642143 has 4 divisors (see below), whose sum is σ = 641695600. Its totient is φ = 641588688.

The previous prime is 641642117. The next prime is 641642149. The reversal of 641642143 is 341246146.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 341246146 = 2 ⋅170623073.

It is a cyclic number.

It is not a de Polignac number, because 641642143 - 2⁹ = 641641631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641642149) 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, 571 + ... + 35827.

It is an arithmetic number, because the mean of its divisors is an integer number (160423900).

Almost surely, 2^641642143 is an apocalyptic number.

641642143 is a deficient number, since it is larger than the sum of its proper divisors (53457).

641642143 is a wasteful number, since it uses less digits than its factorization.

641642143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53456.

The product of its digits is 13824, while the sum is 31.

The square root of 641642143 is about 25330.6561896845. The cubic root of 641642143 is about 862.5103068992.

Adding to 641642143 its reverse (341246146), we get a palindrome (982888289).

The spelling of 641642143 in words is "six hundred forty-one million, six hundred forty-two thousand, one hundred forty-three".