1640169101 has 2 divisors, whose sum is σ = 1640169102. Its totient is φ = 1640169100.

The previous prime is 1640169079. The next prime is 1640169103. The reversal of 1640169101 is 1019610461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1640169001 + 100 = 40499^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640169101 is a prime.

Together with 1640169103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640169103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820084550 + 820084551.

It is an arithmetic number, because the mean of its divisors is an integer number (820084551).

Almost surely, 2^1640169101 is an apocalyptic number.

It is an amenable number.

1640169101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640169101 is an equidigital number, since it uses as much as digits as its factorization.

1640169101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1640169101 is about 40499.0012345984. The cubic root of 1640169101 is about 1179.3142383822.

Adding to 1640169101 its reverse (1019610461), we get a palindrome (2659779562).

The spelling of 1640169101 in words is "one billion, six hundred forty million, one hundred sixty-nine thousand, one hundred one".