81501474143 has 2 divisors, whose sum is σ = 81501474144. Its totient is φ = 81501474142.

The previous prime is 81501474133. The next prime is 81501474161. The reversal of 81501474143 is 34147410518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81501474143 - 2²⁴ = 81484696927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81501474097 and 81501474106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81501474113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40750737071 + 40750737072.

It is an arithmetic number, because the mean of its divisors is an integer number (40750737072).

Almost surely, 2^81501474143 is an apocalyptic number.

81501474143 is a deficient number, since it is larger than the sum of its proper divisors (1).

81501474143 is an equidigital number, since it uses as much as digits as its factorization.

81501474143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 81501474143 in words is "eighty-one billion, five hundred one million, four hundred seventy-four thousand, one hundred forty-three".