4249516581 has 16 divisors (see below), whose sum is σ = 6441990720. Its totient is φ = 2767126320.

The previous prime is 4249516577. The next prime is 4249516591. The reversal of 4249516581 is 1856159424.

4249516581 is a `hidden beast` number, since 42 + 49 + 516 + 58 + 1 = 666.

4249516581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4249516581 - 2² = 4249516577 is a prime.

It is a super-2 number, since 2×4249516581² = 36116782344387859122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4249516541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1828950 + ... + 1831271.

It is an arithmetic number, because the mean of its divisors is an integer number (402624420).

Almost surely, 2^4249516581 is an apocalyptic number.

It is an amenable number.

4249516581 is a deficient number, since it is larger than the sum of its proper divisors (2192474139).

4249516581 is a wasteful number, since it uses less digits than its factorization.

4249516581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3660273 (or 3660267 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 4249516581 is about 65188.3162921087. The cubic root of 4249516581 is about 1619.7444830199.

The spelling of 4249516581 in words is "four billion, two hundred forty-nine million, five hundred sixteen thousand, five hundred eighty-one".