81007118 has 16 divisors (see below), whose sum is σ = 124245360. Its totient is φ = 39599616.

The previous prime is 81007099. The next prime is 81007139. The reversal of 81007118 is 81170018.

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, 20996 + ... + 24552.

It is an arithmetic number, because the mean of its divisors is an integer number (7765335).

Almost surely, 2^81007118 is an apocalyptic number.

81007118 is a deficient number, since it is larger than the sum of its proper divisors (43238242).

81007118 is a wasteful number, since it uses less digits than its factorization.

81007118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 81007118 is about 9000.3954357573. The cubic root of 81007118 is about 432.6875447117.

The spelling of 81007118 in words is "eighty-one million, seven thousand, one hundred eighteen".