641606143 has 2 divisors, whose sum is σ = 641606144. Its totient is φ = 641606142.

The previous prime is 641606099. The next prime is 641606149. The reversal of 641606143 is 341606146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641606143 - 2¹³ = 641597951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641606149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320803071 + 320803072.

It is an arithmetic number, because the mean of its divisors is an integer number (320803072).

Almost surely, 2^641606143 is an apocalyptic number.

641606143 is a deficient number, since it is larger than the sum of its proper divisors (1).

641606143 is an equidigital number, since it uses as much as digits as its factorization.

641606143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 641606143 is about 25329.9455783071. The cubic root of 641606143 is about 862.4941759181.

The spelling of 641606143 in words is "six hundred forty-one million, six hundred six thousand, one hundred forty-three".