4001515081 has 2 divisors, whose sum is σ = 4001515082. Its totient is φ = 4001515080.

The previous prime is 4001515073. The next prime is 4001515129. The reversal of 4001515081 is 1805151004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3679635600 + 321879481 = 60660^2 + 17941^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001515081 - 2³ = 4001515073 is a prime.

It is a super-2 number, since 2×4001515081² = 32024245886940873122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4001515481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000757540 + 2000757541.

It is an arithmetic number, because the mean of its divisors is an integer number (2000757541).

Almost surely, 2^4001515081 is an apocalyptic number.

It is an amenable number.

4001515081 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001515081 is an equidigital number, since it uses as much as digits as its factorization.

4001515081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 4001515081 is about 63257.5298363760. The cubic root of 4001515081 is about 1587.6014467669.

Adding to 4001515081 its reverse (1805151004), we get a palindrome (5806666085).

The spelling of 4001515081 in words is "four billion, one million, five hundred fifteen thousand, eighty-one".