81051120 has 60 divisors (see below), whose sum is σ = 272199096. Its totient is φ = 21613440.

The previous prime is 81051101. The next prime is 81051133. The reversal of 81051120 is 2115018.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 81051093 and 81051102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55566 + ... + 57005.

Almost surely, 2^81051120 is an apocalyptic number.

81051120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81051120 is an abundant number, since it is smaller than the sum of its proper divisors (191147976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81051120 is a wasteful number, since it uses less digits than its factorization.

81051120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112590 (or 112581 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 81051120 is about 9002.8395520525. The cubic root of 81051120 is about 432.7658739235.

Adding to 81051120 its reverse (2115018), we get a palindrome (83166138).

The spelling of 81051120 in words is "eighty-one million, fifty-one thousand, one hundred twenty".