49865521 has 4 divisors (see below), whose sum is σ = 49994100. Its totient is φ = 49736944.

The previous prime is 49865513. The next prime is 49865533. The reversal of 49865521 is 12556894.

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 36433296 + 13432225 = 6036^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 49865521 - 2³ = 49865513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49865591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63706 + ... + 64483.

It is an arithmetic number, because the mean of its divisors is an integer number (12498525).

Almost surely, 2^49865521 is an apocalyptic number.

It is an amenable number.

49865521 is a deficient number, since it is larger than the sum of its proper divisors (128579).

49865521 is a wasteful number, since it uses less digits than its factorization.

49865521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128578.

The product of its digits is 86400, while the sum is 40.

The square root of 49865521 is about 7061.5523080977. The cubic root of 49865521 is about 368.0725700651.

The spelling of 49865521 in words is "forty-nine million, eight hundred sixty-five thousand, five hundred twenty-one".