31721030741 has 2 divisors, whose sum is σ = 31721030742. Its totient is φ = 31721030740.

The previous prime is 31721030723. The next prime is 31721030771. The reversal of 31721030741 is 14703012713.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16480140625 + 15240890116 = 128375^2 + 123454^2 .

It is an emirp because it is prime and its reverse (14703012713) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31721030741 is a prime.

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 (31721030771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15860515370 + 15860515371.

It is an arithmetic number, because the mean of its divisors is an integer number (15860515371).

Almost surely, 2^31721030741 is an apocalyptic number.

It is an amenable number.

31721030741 is a deficient number, since it is larger than the sum of its proper divisors (1).

31721030741 is an equidigital number, since it uses as much as digits as its factorization.

31721030741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The spelling of 31721030741 in words is "thirty-one billion, seven hundred twenty-one million, thirty thousand, seven hundred forty-one".