81130143 has 4 divisors (see below), whose sum is σ = 108173528. Its totient is φ = 54086760.

The previous prime is 81130129. The next prime is 81130163. The reversal of 81130143 is 34103118.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81130143 - 2⁶ = 81130079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130163) 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 in 3 ways as a sum of consecutive naturals, for example, 13521688 + ... + 13521693.

It is an arithmetic number, because the mean of its divisors is an integer number (27043382).

Almost surely, 2^81130143 is an apocalyptic number.

81130143 is a deficient number, since it is larger than the sum of its proper divisors (27043385).

81130143 is a wasteful number, since it uses less digits than its factorization.

81130143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27043384.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 81130143 is about 9007.2272648135. The cubic root of 81130143 is about 432.9064738701.

The spelling of 81130143 in words is "eighty-one million, one hundred thirty thousand, one hundred forty-three".