81754918 has 8 divisors (see below), whose sum is σ = 140151312. Its totient is φ = 35037816.

The previous prime is 81754913. The next prime is 81754951. The reversal of 81754918 is 81945718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81754913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2919805 + ... + 2919832.

It is an arithmetic number, because the mean of its divisors is an integer number (17518914).

Almost surely, 2^81754918 is an apocalyptic number.

81754918 is a deficient number, since it is larger than the sum of its proper divisors (58396394).

81754918 is a wasteful number, since it uses less digits than its factorization.

81754918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839646.

The product of its digits is 80640, while the sum is 43.

The square root of 81754918 is about 9041.8426219438. The cubic root of 81754918 is about 434.0148897325.

The spelling of 81754918 in words is "eighty-one million, seven hundred fifty-four thousand, nine hundred eighteen".