1970243909 has 2 divisors, whose sum is σ = 1970243910. Its totient is φ = 1970243908.

The previous prime is 1970243903. The next prime is 1970243911. The reversal of 1970243909 is 9093420791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1692088225 + 278155684 = 41135^2 + 16678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1970243909 - 2²⁴ = 1953466693 is a prime.

It is a super-2 number, since 2×1970243909² = 7763722121903200562, which contains 22 as substring.

Together with 1970243911, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1970243909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1970243903) 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, 985121954 + 985121955.

It is an arithmetic number, because the mean of its divisors is an integer number (985121955).

Almost surely, 2^1970243909 is an apocalyptic number.

It is an amenable number.

1970243909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1970243909 is an equidigital number, since it uses as much as digits as its factorization.

1970243909 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 44.

The square root of 1970243909 is about 44387.4296282179. The cubic root of 1970243909 is about 1253.6414156926.

The spelling of 1970243909 in words is "one billion, nine hundred seventy million, two hundred forty-three thousand, nine hundred nine".