81462081 has 16 divisors (see below), whose sum is σ = 111505856. Its totient is φ = 52871616.

The previous prime is 81462071. The next prime is 81462089. The reversal of 81462081 is 18026418.

It is not a de Polignac number, because 81462081 - 2²² = 77267777 is a prime.

It is a super-2 number, since 2×81462081² = 13272141281701122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81462089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47271 + ... + 48963.

It is an arithmetic number, because the mean of its divisors is an integer number (6969116).

Almost surely, 2^81462081 is an apocalyptic number.

It is an amenable number.

81462081 is a deficient number, since it is larger than the sum of its proper divisors (30043775).

81462081 is a wasteful number, since it uses less digits than its factorization.

81462081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 81462081 is about 9025.6346591251. The cubic root of 81462081 is about 433.4960721432.

Adding to 81462081 its reverse (18026418), we get a palindrome (99488499).

The spelling of 81462081 in words is "eighty-one million, four hundred sixty-two thousand, eighty-one".