50987281 has 4 divisors (see below), whose sum is σ = 52632064. Its totient is φ = 49342500.

The previous prime is 50987273. The next prime is 50987291. The reversal of 50987281 is 18278905.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 50987281 - 2³ = 50987273 is a prime.

It is a super-2 number, since 2×50987281² = 5199405647545922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50987291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822345 + ... + 822406.

It is an arithmetic number, because the mean of its divisors is an integer number (13158016).

Almost surely, 2^50987281 is an apocalyptic number.

It is an amenable number.

50987281 is a deficient number, since it is larger than the sum of its proper divisors (1644783).

50987281 is a wasteful number, since it uses less digits than its factorization.

50987281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644782.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 50987281 is about 7140.5378648951. The cubic root of 50987281 is about 370.8121459202.

The spelling of 50987281 in words is "fifty million, nine hundred eighty-seven thousand, two hundred eighty-one".