1640950139 has 2 divisors, whose sum is σ = 1640950140. Its totient is φ = 1640950138.

The previous prime is 1640950117. The next prime is 1640950229. The reversal of 1640950139 is 9310590461.

It is a weak prime.

It is an emirp because it is prime and its reverse (9310590461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640950139 - 2²⁰ = 1639901563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640950439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820475069 + 820475070.

It is an arithmetic number, because the mean of its divisors is an integer number (820475070).

Almost surely, 2^1640950139 is an apocalyptic number.

1640950139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640950139 is an equidigital number, since it uses as much as digits as its factorization.

1640950139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 1640950139 is about 40508.6427691672. The cubic root of 1640950139 is about 1179.5014026339.

The spelling of 1640950139 in words is "one billion, six hundred forty million, nine hundred fifty thousand, one hundred thirty-nine".