5001581 has 4 divisors (see below), whose sum is σ = 5386332. Its totient is φ = 4616832.

The previous prime is 5001559. The next prime is 5001593. The reversal of 5001581 is 1851005.

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 1779556 + 3222025 = 1334^2 + 1795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5001581 is a prime.

It is a super-2 number, since 2×5001581² = 50031624999122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5001481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192356 + ... + 192381.

It is an arithmetic number, because the mean of its divisors is an integer number (1346583).

Almost surely, 2^5001581 is an apocalyptic number.

It is an amenable number.

5001581 is a deficient number, since it is larger than the sum of its proper divisors (384751).

5001581 is a wasteful number, since it uses less digits than its factorization.

5001581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384750.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 5001581 is about 2236.4214719055. The cubic root of 5001581 is about 171.0156159148.

Adding to 5001581 its reverse (1851005), we get a palindrome (6852586).

The spelling of 5001581 in words is "five million, one thousand, five hundred eighty-one".