1973762561 has 2 divisors, whose sum is σ = 1973762562. Its totient is φ = 1973762560.

The previous prime is 1973762551. The next prime is 1973762569. The reversal of 1973762561 is 1652673791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1782106225 + 191656336 = 42215^2 + 13844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1973762561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1973762569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986881280 + 986881281.

It is an arithmetic number, because the mean of its divisors is an integer number (986881281).

Almost surely, 2^1973762561 is an apocalyptic number.

It is an amenable number.

1973762561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973762561 is an equidigital number, since it uses as much as digits as its factorization.

1973762561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 47.

The square root of 1973762561 is about 44427.0476286687. The cubic root of 1973762561 is about 1254.3872632020.

The spelling of 1973762561 in words is "one billion, nine hundred seventy-three million, seven hundred sixty-two thousand, five hundred sixty-one".