81228938811151 has 2 divisors, whose sum is σ = 81228938811152. Its totient is φ = 81228938811150.

The previous prime is 81228938811071. The next prime is 81228938811203. The reversal of 81228938811151 is 15111883982218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81228938811151 - 2¹⁷ = 81228938680079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81228938811451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40614469405575 + 40614469405576.

It is an arithmetic number, because the mean of its divisors is an integer number (40614469405576).

Almost surely, 2^{81228938811151} is an apocalyptic number.

81228938811151 is a deficient number, since it is larger than the sum of its proper divisors (1).

81228938811151 is an equidigital number, since it uses as much as digits as its factorization.

81228938811151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2211840, while the sum is 58.

The spelling of 81228938811151 in words is "eighty-one trillion, two hundred twenty-eight billion, nine hundred thirty-eight million, eight hundred eleven thousand, one hundred fifty-one".