41721985397 has 2 divisors, whose sum is σ = 41721985398. Its totient is φ = 41721985396.

The previous prime is 41721985381. The next prime is 41721985423. The reversal of 41721985397 is 79358912714.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31481759761 + 10240225636 = 177431^2 + 101194^2 .

It is a cyclic number.

It is not a de Polignac number, because 41721985397 - 2⁴ = 41721985381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41721985337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20860992698 + 20860992699.

It is an arithmetic number, because the mean of its divisors is an integer number (20860992699).

Almost surely, 2^41721985397 is an apocalyptic number.

It is an amenable number.

41721985397 is a deficient number, since it is larger than the sum of its proper divisors (1).

41721985397 is an equidigital number, since it uses as much as digits as its factorization.

41721985397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The spelling of 41721985397 in words is "forty-one billion, seven hundred twenty-one million, nine hundred eighty-five thousand, three hundred ninety-seven".