1971763393 has 2 divisors, whose sum is σ = 1971763394. Its totient is φ = 1971763392.

The previous prime is 1971763333. The next prime is 1971763397. The reversal of 1971763393 is 3933671791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1269354384 + 702409009 = 35628^2 + 26503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971763393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971763397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985881696 + 985881697.

It is an arithmetic number, because the mean of its divisors is an integer number (985881697).

Almost surely, 2^1971763393 is an apocalyptic number.

It is an amenable number.

1971763393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971763393 is an equidigital number, since it uses as much as digits as its factorization.

1971763393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 642978, while the sum is 49.

The square root of 1971763393 is about 44404.5424815975. The cubic root of 1971763393 is about 1253.9636090651.

The spelling of 1971763393 in words is "one billion, nine hundred seventy-one million, seven hundred sixty-three thousand, three hundred ninety-three".