1973663761 has 2 divisors, whose sum is σ = 1973663762. Its totient is φ = 1973663760.

The previous prime is 1973663749. The next prime is 1973663801. The reversal of 1973663761 is 1673663791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1111889025 + 861774736 = 33345^2 + 29356^2 .

It is an emirp because it is prime and its reverse (1673663791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1973663761 - 2⁷ = 1973663633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1973663261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986831880 + 986831881.

It is an arithmetic number, because the mean of its divisors is an integer number (986831881).

Almost surely, 2^1973663761 is an apocalyptic number.

It is an amenable number.

1973663761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973663761 is an equidigital number, since it uses as much as digits as its factorization.

1973663761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 49.

The square root of 1973663761 is about 44425.9356795105. The cubic root of 1973663761 is about 1254.3663326991.

The spelling of 1973663761 in words is "one billion, nine hundred seventy-three million, six hundred sixty-three thousand, seven hundred sixty-one".