61981051193 has 2 divisors, whose sum is σ = 61981051194. Its totient is φ = 61981051192.

The previous prime is 61981051189. The next prime is 61981051217. The reversal of 61981051193 is 39115018916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40703869504 + 21277181689 = 201752^2 + 145867^2 .

It is a cyclic number.

It is not a de Polignac number, because 61981051193 - 2² = 61981051189 is a prime.

It is not a weakly prime, because it can be changed into another prime (61981051103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30990525596 + 30990525597.

It is an arithmetic number, because the mean of its divisors is an integer number (30990525597).

Almost surely, 2^61981051193 is an apocalyptic number.

It is an amenable number.

61981051193 is a deficient number, since it is larger than the sum of its proper divisors (1).

61981051193 is an equidigital number, since it uses as much as digits as its factorization.

61981051193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 44.

The spelling of 61981051193 in words is "sixty-one billion, nine hundred eighty-one million, fifty-one thousand, one hundred ninety-three".