80781001 has 4 divisors (see below), whose sum is σ = 92321152. Its totient is φ = 69240852.

The previous prime is 80780993. The next prime is 80781013. The reversal of 80781001 is 10018708.

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 80781001 - 2³ = 80780993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80781061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5770065 + ... + 5770078.

It is an arithmetic number, because the mean of its divisors is an integer number (23080288).

Almost surely, 2^80781001 is an apocalyptic number.

It is an amenable number.

80781001 is a deficient number, since it is larger than the sum of its proper divisors (11540151).

80781001 is a wasteful number, since it uses less digits than its factorization.

80781001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11540150.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 80781001 is about 8987.8251540626. The cubic root of 80781001 is about 432.2845793679.

Adding to 80781001 its reverse (10018708), we get a palindrome (90799709).

The spelling of 80781001 in words is "eighty million, seven hundred eighty-one thousand, one".