642464101 has 2 divisors, whose sum is σ = 642464102. Its totient is φ = 642464100.

The previous prime is 642464093. The next prime is 642464117. The reversal of 642464101 is 101464246.

642464101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483956001 + 158508100 = 21999^2 + 12590^2 .

It is a cyclic number.

It is not a de Polignac number, because 642464101 - 2³ = 642464093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642464101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642464201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321232050 + 321232051.

It is an arithmetic number, because the mean of its divisors is an integer number (321232051).

Almost surely, 2^642464101 is an apocalyptic number.

It is an amenable number.

642464101 is a deficient number, since it is larger than the sum of its proper divisors (1).

642464101 is an equidigital number, since it uses as much as digits as its factorization.

642464101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 642464101 is about 25346.8755668228. The cubic root of 642464101 is about 862.8784481048.

The spelling of 642464101 in words is "six hundred forty-two million, four hundred sixty-four thousand, one hundred one".