1640850929 has 2 divisors, whose sum is σ = 1640850930. Its totient is φ = 1640850928.

The previous prime is 1640850907. The next prime is 1640850941. The reversal of 1640850929 is 9290580461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1628283904 + 12567025 = 40352^2 + 3545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640850929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640850929.

It is not a weakly prime, because it can be changed into another prime (1640850989) 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, 820425464 + 820425465.

It is an arithmetic number, because the mean of its divisors is an integer number (820425465).

Almost surely, 2^1640850929 is an apocalyptic number.

It is an amenable number.

1640850929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640850929 is an equidigital number, since it uses as much as digits as its factorization.

1640850929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 1640850929 is about 40507.4181971648. The cubic root of 1640850929 is about 1179.4776317121.

The spelling of 1640850929 in words is "one billion, six hundred forty million, eight hundred fifty thousand, nine hundred twenty-nine".