81281126 has 32 divisors (see below), whose sum is σ = 135267840. Its totient is φ = 36457344.

The previous prime is 81281099. The next prime is 81281203. The reversal of 81281126 is 62118218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98351 + ... + 99173.

It is an arithmetic number, because the mean of its divisors is an integer number (4227120).

Almost surely, 2^81281126 is an apocalyptic number.

81281126 is a deficient number, since it is larger than the sum of its proper divisors (53986714).

81281126 is a wasteful number, since it uses less digits than its factorization.

81281126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its digits is 1536, while the sum is 29.

The square root of 81281126 is about 9015.6045831658. The cubic root of 81281126 is about 433.1748534214.

The spelling of 81281126 in words is "eighty-one million, two hundred eighty-one thousand, one hundred twenty-six".