81438801 has 8 divisors (see below), whose sum is σ = 108897600. Its totient is φ = 54136272.

The previous prime is 81438787. The next prime is 81438839. The reversal of 81438801 is 10883418.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81438801 - 2⁷ = 81438673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81438881) 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, 37845 + ... + 39938.

It is an arithmetic number, because the mean of its divisors is an integer number (13612200).

Almost surely, 2^81438801 is an apocalyptic number.

It is an amenable number.

81438801 is a deficient number, since it is larger than the sum of its proper divisors (27458799).

81438801 is a wasteful number, since it uses less digits than its factorization.

81438801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78135.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81438801 is about 9024.3449069725. The cubic root of 81438801 is about 433.4547737873.

The spelling of 81438801 in words is "eighty-one million, four hundred thirty-eight thousand, eight hundred one".