61843741021 has 2 divisors, whose sum is σ = 61843741022. Its totient is φ = 61843741020.

The previous prime is 61843741013. The next prime is 61843741073. The reversal of 61843741021 is 12014734816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49157097796 + 12686643225 = 221714^2 + 112635^2 .

It is a cyclic number.

It is not a de Polignac number, because 61843741021 - 2³ = 61843741013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61843741621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30921870510 + 30921870511.

It is an arithmetic number, because the mean of its divisors is an integer number (30921870511).

Almost surely, 2^61843741021 is an apocalyptic number.

It is an amenable number.

61843741021 is a deficient number, since it is larger than the sum of its proper divisors (1).

61843741021 is an equidigital number, since it uses as much as digits as its factorization.

61843741021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 61843741021 in words is "sixty-one billion, eight hundred forty-three million, seven hundred forty-one thousand, twenty-one".