1969797281 has 2 divisors, whose sum is σ = 1969797282. Its totient is φ = 1969797280.

The previous prime is 1969797223. The next prime is 1969797289. The reversal of 1969797281 is 1827979691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1271992225 + 697805056 = 35665^2 + 26416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1969797281 is a prime.

It is a super-2 number, since 2×1969797281² = 7760202656469985922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1969797281.

It is not a weakly prime, because it can be changed into another prime (1969797289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984898640 + 984898641.

It is an arithmetic number, because the mean of its divisors is an integer number (984898641).

Almost surely, 2^1969797281 is an apocalyptic number.

It is an amenable number.

1969797281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969797281 is an equidigital number, since it uses as much as digits as its factorization.

1969797281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 59.

The square root of 1969797281 is about 44382.3983241104. The cubic root of 1969797281 is about 1253.5466806078.

The spelling of 1969797281 in words is "one billion, nine hundred sixty-nine million, seven hundred ninety-seven thousand, two hundred eighty-one".