3709309319981 has 2 divisors, whose sum is σ = 3709309319982. Its totient is φ = 3709309319980.

The previous prime is 3709309319887. The next prime is 3709309320029. The reversal of 3709309319981 is 1899139039073.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2924472791881 + 784836528100 = 1710109^2 + 885910^2 .

It is a cyclic number.

It is not a de Polignac number, because 3709309319981 - 2³⁸ = 3434431413037 is a prime.

It is a super-2 number, since 2×3709309319981² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3709309319581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1854654659990 + 1854654659991.

It is an arithmetic number, because the mean of its divisors is an integer number (1854654659991).

Almost surely, 2^{3709309319981} is an apocalyptic number.

It is an amenable number.

3709309319981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3709309319981 is an equidigital number, since it uses as much as digits as its factorization.

3709309319981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9920232, while the sum is 62.

The spelling of 3709309319981 in words is "three trillion, seven hundred nine billion, three hundred nine million, three hundred nineteen thousand, nine hundred eighty-one".