640446101 has 2 divisors, whose sum is σ = 640446102. Its totient is φ = 640446100.

The previous prime is 640446077. The next prime is 640446113. The reversal of 640446101 is 101644046.

640446101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621305476 + 19140625 = 24926^2 + 4375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640446101 is a prime.

It is a super-2 number, since 2×640446101² = 820342416572204402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640446181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320223050 + 320223051.

It is an arithmetic number, because the mean of its divisors is an integer number (320223051).

Almost surely, 2^640446101 is an apocalyptic number.

It is an amenable number.

640446101 is a deficient number, since it is larger than the sum of its proper divisors (1).

640446101 is an equidigital number, since it uses as much as digits as its factorization.

640446101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 640446101 is about 25307.0365906402. The cubic root of 640446101 is about 861.9740577317.

The spelling of 640446101 in words is "six hundred forty million, four hundred forty-six thousand, one hundred one".