4000250081 has 2 divisors, whose sum is σ = 4000250082. Its totient is φ = 4000250080.

The previous prime is 4000250077. The next prime is 4000250119. The reversal of 4000250081 is 1800520004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2360405056 + 1639845025 = 48584^2 + 40495^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000250081 - 2² = 4000250077 is a prime.

It is a super-2 number, since 2×4000250081² = 32004001421081013122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4000250581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000125040 + 2000125041.

It is an arithmetic number, because the mean of its divisors is an integer number (2000125041).

Almost surely, 2^4000250081 is an apocalyptic number.

It is an amenable number.

4000250081 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000250081 is an equidigital number, since it uses as much as digits as its factorization.

4000250081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 4000250081 is about 63247.5302363658. The cubic root of 4000250081 is about 1587.4341328490.

Adding to 4000250081 its reverse (1800520004), we get a palindrome (5800770085).

The spelling of 4000250081 in words is "four billion, two hundred fifty thousand, eighty-one".