81280001 has 4 divisors (see below), whose sum is σ = 88669104. Its totient is φ = 73890900.

The previous prime is 81279983. The next prime is 81280037. The reversal of 81280001 is 10008218.

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.

It is a cyclic number.

It is not a de Polignac number, because 81280001 - 2⁶ = 81279937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81280201) 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, 3694535 + ... + 3694556.

It is an arithmetic number, because the mean of its divisors is an integer number (22167276).

Almost surely, 2^81280001 is an apocalyptic number.

It is an amenable number.

81280001 is a deficient number, since it is larger than the sum of its proper divisors (7389103).

81280001 is a wasteful number, since it uses less digits than its factorization.

81280001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389102.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 81280001 is about 9015.5421911275. The cubic root of 81280001 is about 433.1728549093.

Adding to 81280001 its reverse (10008218), we get a palindrome (91288219).

It can be divided in two parts, 81 and 280001, that added together give a palindrome (280082).

The spelling of 81280001 in words is "eighty-one million, two hundred eighty thousand, one".