49999581 has 6 divisors (see below), whose sum is σ = 72221630. Its totient is φ = 33333048.

The previous prime is 49999561. The next prime is 49999589. The reversal of 49999581 is 18599994.

It can be written as a sum of positive squares in only one way, i.e., 33524100 + 16475481 = 5790^2 + 4059^2 .

It is not a de Polignac number, because 49999581 - 2⁹ = 49999069 is a prime.

It is a super-2 number, since 2×49999581² = 4999916200351122, 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 (49999589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2777746 + ... + 2777763.

Almost surely, 2^49999581 is an apocalyptic number.

It is an amenable number.

49999581 is a deficient number, since it is larger than the sum of its proper divisors (22222049).

49999581 is a wasteful number, since it uses less digits than its factorization.

49999581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555515 (or 5555512 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 49999581 is about 7071.0381840293. The cubic root of 49999581 is about 368.4021207884.

The spelling of 49999581 in words is "forty-nine million, nine hundred ninety-nine thousand, five hundred eighty-one".