81130043 has 2 divisors, whose sum is σ = 81130044. Its totient is φ = 81130042.

The previous prime is 81129959. The next prime is 81130073. The reversal of 81130043 is 34003118.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81130043 - 2¹⁰ = 81129019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81129997 and 81130024.

It is not a weakly prime, because it can be changed into another prime (81130073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40565021 + 40565022.

It is an arithmetic number, because the mean of its divisors is an integer number (40565022).

Almost surely, 2^81130043 is an apocalyptic number.

81130043 is a deficient number, since it is larger than the sum of its proper divisors (1).

81130043 is an equidigital number, since it uses as much as digits as its factorization.

81130043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 81130043 is about 9007.2217137139. The cubic root of 81130043 is about 432.9062960050.

The spelling of 81130043 in words is "eighty-one million, one hundred thirty thousand, forty-three".