81051418 has 16 divisors (see below), whose sum is σ = 139426560. Its totient is φ = 34616016.

The previous prime is 81051413. The next prime is 81051457. The reversal of 81051418 is 81415018.

It is not an unprimeable number, because it can be changed into a prime (81051413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5778 + ... + 13981.

It is an arithmetic number, because the mean of its divisors is an integer number (8714160).

Almost surely, 2^81051418 is an apocalyptic number.

81051418 is a deficient number, since it is larger than the sum of its proper divisors (58375142).

81051418 is a wasteful number, since it uses less digits than its factorization.

81051418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20061.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 81051418 is about 9002.8561023711. The cubic root of 81051418 is about 432.7664043051.

The spelling of 81051418 in words is "eighty-one million, fifty-one thousand, four hundred eighteen".