50191681 has 8 divisors (see below), whose sum is σ = 52493184. Its totient is φ = 47900160.

The previous prime is 50191679. The next prime is 50191751. The reversal of 50191681 is 18619105.

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

It is a 5-Lehmer number, since φ(50191681) divides (50191681-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 50191681 - 2¹ = 50191679 is a prime.

It is a super-2 number, since 2×50191681² = 5038409683211522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50191601) 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, 8961 + ... + 13441.

It is an arithmetic number, because the mean of its divisors is an integer number (6561648).

Almost surely, 2^50191681 is an apocalyptic number.

50191681 is the 4481-st heptagonal number.

It is an amenable number.

50191681 is a deficient number, since it is larger than the sum of its proper divisors (2301503).

50191681 is a wasteful number, since it uses less digits than its factorization.

50191681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4991.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 50191681 is about 7084.6087400787. The cubic root of 50191681 is about 368.8733221155.

The spelling of 50191681 in words is "fifty million, one hundred ninety-one thousand, six hundred eighty-one".