81868801 has 4 divisors (see below), whose sum is σ = 93564352. Its totient is φ = 70173252.

The previous prime is 81868747. The next prime is 81868811. The reversal of 81868801 is 10886818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10886818 = 2 ⋅5443409.

It is a cyclic number.

It is not a de Polignac number, because 81868801 - 2⁷ = 81868673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81868811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5847765 + ... + 5847778.

It is an arithmetic number, because the mean of its divisors is an integer number (23391088).

Almost surely, 2^81868801 is an apocalyptic number.

It is an amenable number.

81868801 is a deficient number, since it is larger than the sum of its proper divisors (11695551).

81868801 is a wasteful number, since it uses less digits than its factorization.

81868801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11695550.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 81868801 is about 9048.1379852432. The cubic root of 81868801 is about 434.2163209792.

The spelling of 81868801 in words is "eighty-one million, eight hundred sixty-eight thousand, eight hundred one".