1640173013 has 2 divisors, whose sum is σ = 1640173014. Its totient is φ = 1640173012.

The previous prime is 1640173009. The next prime is 1640173021. The reversal of 1640173013 is 3103710461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1569982129 + 70190884 = 39623^2 + 8378^2 .

It is an emirp because it is prime and its reverse (3103710461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640173013 - 2² = 1640173009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640173813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820086506 + 820086507.

It is an arithmetic number, because the mean of its divisors is an integer number (820086507).

Almost surely, 2^1640173013 is an apocalyptic number.

It is an amenable number.

1640173013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640173013 is an equidigital number, since it uses as much as digits as its factorization.

1640173013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1640173013 is about 40499.0495320569. The cubic root of 1640173013 is about 1179.3151759834.

Adding to 1640173013 its reverse (3103710461), we get a palindrome (4743883474).

The spelling of 1640173013 in words is "one billion, six hundred forty million, one hundred seventy-three thousand, thirteen".