50881781 has 4 divisors (see below), whose sum is σ = 50899392. Its totient is φ = 50864172.

The previous prime is 50881769. The next prime is 50881807. The reversal of 50881781 is 18718805.

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 50881781 - 2⁶ = 50881717 is a prime.

It is a super-3 number, since 3×50881781³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50811781) 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, 3341 + ... + 10626.

It is an arithmetic number, because the mean of its divisors is an integer number (12724848).

Almost surely, 2^50881781 is an apocalyptic number.

It is an amenable number.

50881781 is a deficient number, since it is larger than the sum of its proper divisors (17611).

50881781 is a wasteful number, since it uses less digits than its factorization.

50881781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17610.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 50881781 is about 7133.1466408591. The cubic root of 50881781 is about 370.5562148083.

The spelling of 50881781 in words is "fifty million, eight hundred eighty-one thousand, seven hundred eighty-one".