642326101 has 2 divisors, whose sum is σ = 642326102. Its totient is φ = 642326100.

The previous prime is 642326077. The next prime is 642326161. The reversal of 642326101 is 101623246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378263601 + 264062500 = 19449^2 + 16250^2 .

It is a cyclic number.

It is not a de Polignac number, because 642326101 - 2⁹ = 642325589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642326161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321163050 + 321163051.

It is an arithmetic number, because the mean of its divisors is an integer number (321163051).

Almost surely, 2^642326101 is an apocalyptic number.

It is an amenable number.

642326101 is a deficient number, since it is larger than the sum of its proper divisors (1).

642326101 is an equidigital number, since it uses as much as digits as its factorization.

642326101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 642326101 is about 25344.1531916140. The cubic root of 642326101 is about 862.8166621609.

Adding to 642326101 its reverse (101623246), we get a palindrome (743949347).

The spelling of 642326101 in words is "six hundred forty-two million, three hundred twenty-six thousand, one hundred one".