81130541982 has 16 divisors (see below), whose sum is σ = 185441238912. Its totient is φ = 23180154840.

The previous prime is 81130541879. The next prime is 81130542019. The reversal of 81130541982 is 28914503118.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1931679571 = 81130541982 / (8 + 1 + 1 + 3 + 0 + 5 + 4 + 1 + 9 + 8 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965839744 + ... + 965839827.

It is an arithmetic number, because the mean of its divisors is an integer number (11590077432).

Almost surely, 2^81130541982 is an apocalyptic number.

81130541982 is an abundant number, since it is smaller than the sum of its proper divisors (104310696930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81130541982 is a wasteful number, since it uses less digits than its factorization.

81130541982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931679583.

The product of its (nonzero) digits is 69120, while the sum is 42.

The spelling of 81130541982 in words is "eighty-one billion, one hundred thirty million, five hundred forty-one thousand, nine hundred eighty-two".