4999581 has 24 divisors (see below), whose sum is σ = 7842744. Its totient is φ = 3056640.

The previous prime is 4999559. The next prime is 4999591. The reversal of 4999581 is 1859994.

4999581 = 329² + 330² + ... + 369².

It can be written as a sum of positive squares in 4 ways, for example, as 308025 + 4691556 = 555^2 + 2166^2 .

It is not a de Polignac number, because 4999581 - 2⁷ = 4999453 is a prime.

It is a super-2 number, since 2×4999581² = 49991620351122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4999591) 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 23 ways as a sum of consecutive naturals, for example, 5875 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (326781).

Almost surely, 2^4999581 is an apocalyptic number.

4999581 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4999581 is a deficient number, since it is larger than the sum of its proper divisors (2843163).

4999581 is a wasteful number, since it uses less digits than its factorization.

4999581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 858 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 4999581 is about 2235.9742842886. The cubic root of 4999581 is about 170.9928180014.

The spelling of 4999581 in words is "four million, nine hundred ninety-nine thousand, five hundred eighty-one".