49987521 has 6 divisors (see below), whose sum is σ = 72204210. Its totient is φ = 33325008.

The previous prime is 49987517. The next prime is 49987523. The reversal of 49987521 is 12578994.

49987521 is a `hidden beast` number, since 49 + 9 + 87 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 47114496 + 2873025 = 6864^2 + 1695^2 .

It is not a de Polignac number, because 49987521 - 2² = 49987517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (49987523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2777076 + ... + 2777093.

It is an arithmetic number, because the mean of its divisors is an integer number (12034035).

Almost surely, 2^49987521 is an apocalyptic number.

It is an amenable number.

49987521 is a deficient number, since it is larger than the sum of its proper divisors (22216689).

49987521 is a wasteful number, since it uses less digits than its factorization.

49987521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554175 (or 5554172 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 49987521 is about 7070.1853582491. The cubic root of 49987521 is about 368.3724986279.

The spelling of 49987521 in words is "forty-nine million, nine hundred eighty-seven thousand, five hundred twenty-one".