50091781 has 8 divisors (see below), whose sum is σ = 50929560. Its totient is φ = 49260288.

The previous prime is 50091773. The next prime is 50091793. The reversal of 50091781 is 18719005.

It can be written as a sum of positive squares in 4 ways, for example, as 17715681 + 32376100 = 4209^2 + 5690^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 50091781 - 2³ = 50091773 is a prime.

It is a super-2 number, since 2×50091781² = 5018373047503922, 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 (50095781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16105 + ... + 18961.

It is an arithmetic number, because the mean of its divisors is an integer number (6366195).

Almost surely, 2^50091781 is an apocalyptic number.

It is an amenable number.

50091781 is a deficient number, since it is larger than the sum of its proper divisors (837779).

50091781 is a wasteful number, since it uses less digits than its factorization.

50091781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3143.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 50091781 is about 7077.5547330981. The cubic root of 50091781 is about 368.6284281418.

The spelling of 50091781 in words is "fifty million, ninety-one thousand, seven hundred eighty-one".