81230518 has 8 divisors (see below), whose sum is σ = 122045112. Its totient is φ = 40548816.

The previous prime is 81230497. The next prime is 81230519. The reversal of 81230518 is 81503218.

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 (81230519) 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, 31680 + ... + 34147.

It is an arithmetic number, because the mean of its divisors is an integer number (15255639).

Almost surely, 2^81230518 is an apocalyptic number.

81230518 is a deficient number, since it is larger than the sum of its proper divisors (40814594).

81230518 is a wasteful number, since it uses less digits than its factorization.

81230518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66446.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 81230518 is about 9012.7974569498. The cubic root of 81230518 is about 433.0849323232.

The spelling of 81230518 in words is "eighty-one million, two hundred thirty thousand, five hundred eighteen".