1973954161 has 2 divisors, whose sum is σ = 1973954162. Its totient is φ = 1973954160.

The previous prime is 1973954159. The next prime is 1973954189. The reversal of 1973954161 is 1614593791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1503888400 + 470065761 = 38780^2 + 21681^2 .

It is an emirp because it is prime and its reverse (1614593791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1973954161 - 2¹ = 1973954159 is a prime.

Together with 1973954159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1973954561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986977080 + 986977081.

It is an arithmetic number, because the mean of its divisors is an integer number (986977081).

Almost surely, 2^1973954161 is an apocalyptic number.

It is an amenable number.

1973954161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973954161 is an equidigital number, since it uses as much as digits as its factorization.

1973954161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 46.

The square root of 1973954161 is about 44429.2039203945. The cubic root of 1973954161 is about 1254.4278511343.

The spelling of 1973954161 in words is "one billion, nine hundred seventy-three million, nine hundred fifty-four thousand, one hundred sixty-one".