1972318709 has 2 divisors, whose sum is σ = 1972318710. Its totient is φ = 1972318708.

The previous prime is 1972318697. The next prime is 1972318723. The reversal of 1972318709 is 9078132791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1934064484 + 38254225 = 43978^2 + 6185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972318709 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972314709) 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, 986159354 + 986159355.

It is an arithmetic number, because the mean of its divisors is an integer number (986159355).

Almost surely, 2^1972318709 is an apocalyptic number.

It is an amenable number.

1972318709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972318709 is an equidigital number, since it uses as much as digits as its factorization.

1972318709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 1972318709 is about 44410.7949602346. The cubic root of 1972318709 is about 1254.0813176936.

The spelling of 1972318709 in words is "one billion, nine hundred seventy-two million, three hundred eighteen thousand, seven hundred nine".