3719972561 has 2 divisors, whose sum is σ = 3719972562. Its totient is φ = 3719972560.

The previous prime is 3719972491. The next prime is 3719972567. The reversal of 3719972561 is 1652799173.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3614294161 + 105678400 = 60119^2 + 10280^2 .

It is an emirp because it is prime and its reverse (1652799173) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3719972561 is a prime.

It is not a weakly prime, because it can be changed into another prime (3719972567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1859986280 + 1859986281.

It is an arithmetic number, because the mean of its divisors is an integer number (1859986281).

Almost surely, 2^3719972561 is an apocalyptic number.

It is an amenable number.

3719972561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3719972561 is an equidigital number, since it uses as much as digits as its factorization.

3719972561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 50.

The square root of 3719972561 is about 60991.5777874290. The cubic root of 3719972561 is about 1549.4583693399.

The spelling of 3719972561 in words is "three billion, seven hundred nineteen million, nine hundred seventy-two thousand, five hundred sixty-one".