81000015143 has 2 divisors, whose sum is σ = 81000015144. Its totient is φ = 81000015142.

The previous prime is 81000015127. The next prime is 81000015221. The reversal of 81000015143 is 34151000018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81000015143 - 2⁴ = 81000015127 is a prime.

It is a super-2 number, since 2×81000015143² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81000045143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500007571 + 40500007572.

It is an arithmetic number, because the mean of its divisors is an integer number (40500007572).

Almost surely, 2^81000015143 is an apocalyptic number.

81000015143 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000015143 is an equidigital number, since it uses as much as digits as its factorization.

81000015143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The spelling of 81000015143 in words is "eighty-one billion, fifteen thousand, one hundred forty-three".