1969221973 has 2 divisors, whose sum is σ = 1969221974. Its totient is φ = 1969221972.

The previous prime is 1969221967. The next prime is 1969222037. The reversal of 1969221973 is 3791229691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488647889 + 480574084 = 38583^2 + 21922^2 .

It is a cyclic number.

It is not a de Polignac number, because 1969221973 - 2⁹ = 1969221461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1969221073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984610986 + 984610987.

It is an arithmetic number, because the mean of its divisors is an integer number (984610987).

Almost surely, 2^1969221973 is an apocalyptic number.

It is an amenable number.

1969221973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969221973 is an equidigital number, since it uses as much as digits as its factorization.

1969221973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 1969221973 is about 44375.9165877168. The cubic root of 1969221973 is about 1253.4246298665.

The spelling of 1969221973 in words is "one billion, nine hundred sixty-nine million, two hundred twenty-one thousand, nine hundred seventy-three".