8781250001 has 4 divisors (see below), whose sum is σ = 8858960292. Its totient is φ = 8703539712.

The previous prime is 8781249991. The next prime is 8781250003. The reversal of 8781250001 is 1000521878.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187032976 + 8594217025 = 13676^2 + 92705^2 .

It is a cyclic number.

It is not a de Polignac number, because 8781250001 - 2³⁰ = 7707508177 is a prime.

It is a super-2 number, since 2×8781250001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8781250001.

It is not an unprimeable number, because it can be changed into a prime (8781250003) 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, 38854976 + ... + 38855201.

It is an arithmetic number, because the mean of its divisors is an integer number (2214740073).

Almost surely, 2^8781250001 is an apocalyptic number.

It is an amenable number.

8781250001 is a deficient number, since it is larger than the sum of its proper divisors (77710291).

8781250001 is a wasteful number, since it uses less digits than its factorization.

8781250001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77710290.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 8781250001 is about 93708.3240752923. The cubic root of 8781250001 is about 2063.0928813632.

Adding to 8781250001 its reverse (1000521878), we get a palindrome (9781771879).

The spelling of 8781250001 in words is "eight billion, seven hundred eighty-one million, two hundred fifty thousand, one".