81074169251 has 2 divisors, whose sum is σ = 81074169252. Its totient is φ = 81074169250.

The previous prime is 81074169229. The next prime is 81074169287. The reversal of 81074169251 is 15296147018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81074169251 - 2³⁰ = 80000427427 is a prime.

It is not a weakly prime, because it can be changed into another prime (81074162251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40537084625 + 40537084626.

It is an arithmetic number, because the mean of its divisors is an integer number (40537084626).

Almost surely, 2^81074169251 is an apocalyptic number.

81074169251 is a deficient number, since it is larger than the sum of its proper divisors (1).

81074169251 is an equidigital number, since it uses as much as digits as its factorization.

81074169251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 81074169251 in words is "eighty-one billion, seventy-four million, one hundred sixty-nine thousand, two hundred fifty-one".