1971364609 has 2 divisors, whose sum is σ = 1971364610. Its totient is φ = 1971364608.

The previous prime is 1971364601. The next prime is 1971364631. The reversal of 1971364609 is 9064631791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359544384 + 611820225 = 36872^2 + 24735^2 .

It is an emirp because it is prime and its reverse (9064631791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1971364609 - 2³ = 1971364601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971364601) 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, 985682304 + 985682305.

It is an arithmetic number, because the mean of its divisors is an integer number (985682305).

Almost surely, 2^1971364609 is an apocalyptic number.

It is an amenable number.

1971364609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971364609 is an equidigital number, since it uses as much as digits as its factorization.

1971364609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1971364609 is about 44400.0519031228. The cubic root of 1971364609 is about 1253.8790664097.

The spelling of 1971364609 in words is "one billion, nine hundred seventy-one million, three hundred sixty-four thousand, six hundred nine".