1973613409 has 2 divisors, whose sum is σ = 1973613410. Its totient is φ = 1973613408.

The previous prime is 1973613403. The next prime is 1973613431. The reversal of 1973613409 is 9043163791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1445900625 + 527712784 = 38025^2 + 22972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1973613409 - 2¹³ = 1973605217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1973613403) 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, 986806704 + 986806705.

It is an arithmetic number, because the mean of its divisors is an integer number (986806705).

Almost surely, 2^1973613409 is an apocalyptic number.

It is an amenable number.

1973613409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973613409 is an equidigital number, since it uses as much as digits as its factorization.

1973613409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 1973613409 is about 44425.3689798971. The cubic root of 1973613409 is about 1254.3556655003.

The spelling of 1973613409 in words is "one billion, nine hundred seventy-three million, six hundred thirteen thousand, four hundred nine".