1640636099 has 2 divisors, whose sum is σ = 1640636100. Its totient is φ = 1640636098.

The previous prime is 1640636047. The next prime is 1640636143. The reversal of 1640636099 is 9906360461.

It is an a-pointer prime, because the next prime (1640636143) can be obtained adding 1640636099 to its sum of digits (44).

It is a strong prime.

It is an emirp because it is prime and its reverse (9906360461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640636099 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1640636399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820318049 + 820318050.

It is an arithmetic number, because the mean of its divisors is an integer number (820318050).

Almost surely, 2^1640636099 is an apocalyptic number.

1640636099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640636099 is an equidigital number, since it uses as much as digits as its factorization.

1640636099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 1640636099 is about 40504.7663738479. The cubic root of 1640636099 is about 1179.4261547143.

The spelling of 1640636099 in words is "one billion, six hundred forty million, six hundred thirty-six thousand, ninety-nine".