81142983 has 12 divisors (see below), whose sum is σ = 117361608. Its totient is φ = 54023760.

The previous prime is 81142973. The next prime is 81143047. The reversal of 81142983 is 38924118.

It is not a de Polignac number, because 81142983 - 2⁵ = 81142951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81142913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1741 + ... + 12857.

It is an arithmetic number, because the mean of its divisors is an integer number (9780134).

Almost surely, 2^81142983 is an apocalyptic number.

81142983 is a deficient number, since it is larger than the sum of its proper divisors (36218625).

81142983 is a wasteful number, since it uses less digits than its factorization.

81142983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11934 (or 11931 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 81142983 is about 9007.9399975799. The cubic root of 81142983 is about 432.9293105360.

The spelling of 81142983 in words is "eighty-one million, one hundred forty-two thousand, nine hundred eighty-three".