1650640961 has 2 divisors, whose sum is σ = 1650640962. Its totient is φ = 1650640960.

The previous prime is 1650640919. The next prime is 1650641021. The reversal of 1650640961 is 1690460561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1167520561 + 483120400 = 34169^2 + 21980^2 .

It is an emirp because it is prime and its reverse (1690460561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1650640961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1650640661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825320480 + 825320481.

It is an arithmetic number, because the mean of its divisors is an integer number (825320481).

Almost surely, 2^1650640961 is an apocalyptic number.

It is an amenable number.

1650640961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650640961 is an equidigital number, since it uses as much as digits as its factorization.

1650640961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1650640961 is about 40628.0809416344. The cubic root of 1650640961 is about 1181.8187410955.

The spelling of 1650640961 in words is "one billion, six hundred fifty million, six hundred forty thousand, nine hundred sixty-one".