81051058948913 has 2 divisors, whose sum is σ = 81051058948914. Its totient is φ = 81051058948912.

The previous prime is 81051058948889. The next prime is 81051058948991. The reversal of 81051058948913 is 31984985015018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80330475276529 + 720583672384 = 8962727^2 + 848872^2 .

It is a cyclic number.

It is not a de Polignac number, because 81051058948913 - 2¹⁸ = 81051058686769 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (81051058948213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40525529474456 + 40525529474457.

It is an arithmetic number, because the mean of its divisors is an integer number (40525529474457).

Almost surely, 2^{81051058948913} is an apocalyptic number.

It is an amenable number.

81051058948913 is a deficient number, since it is larger than the sum of its proper divisors (1).

81051058948913 is an equidigital number, since it uses as much as digits as its factorization.

81051058948913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12441600, while the sum is 62.

The spelling of 81051058948913 in words is "eighty-one trillion, fifty-one billion, fifty-eight million, nine hundred forty-eight thousand, nine hundred thirteen".