81041851 has 16 divisors (see below), whose sum is σ = 90091008. Its totient is φ = 72288000.

The previous prime is 81041837. The next prime is 81041867. The reversal of 81041851 is 15814018.

It is a cyclic number.

It is not a de Polignac number, because 81041851 - 2⁵ = 81041819 is a prime.

It is a super-2 number, since 2×81041851² = 13135563227012402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81041881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160866 + ... + 161368.

It is an arithmetic number, because the mean of its divisors is an integer number (5630688).

Almost surely, 2^81041851 is an apocalyptic number.

81041851 is a deficient number, since it is larger than the sum of its proper divisors (9049157).

81041851 is a wasteful number, since it uses less digits than its factorization.

81041851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762.

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

The square root of 81041851 is about 9002.3247553063. The cubic root of 81041851 is about 432.7493762703.

Adding to 81041851 its reverse (15814018), we get a palindrome (96855869).

The spelling of 81041851 in words is "eighty-one million, forty-one thousand, eight hundred fifty-one".