81037143 has 24 divisors (see below), whose sum is σ = 127994256. Its totient is φ = 48998400.

The previous prime is 81037091. The next prime is 81037153. The reversal of 81037143 is 34173018.

It is not a de Polignac number, because 81037143 - 2¹⁰ = 81036119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81037153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62821 + ... + 64097.

It is an arithmetic number, because the mean of its divisors is an integer number (5333094).

Almost surely, 2^81037143 is an apocalyptic number.

81037143 is a deficient number, since it is larger than the sum of its proper divisors (46957113).

81037143 is a wasteful number, since it uses less digits than its factorization.

81037143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935 (or 1932 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 81037143 is about 9002.0632634969. The cubic root of 81037143 is about 432.7409961412.

The spelling of 81037143 in words is "eighty-one million, thirty-seven thousand, one hundred forty-three".