50991585 has 16 divisors (see below), whose sum is σ = 86386176. Its totient is φ = 25595648.

The previous prime is 50991581. The next prime is 50991601. The reversal of 50991585 is 58519905.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 50991585 - 2² = 50991581 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (50991581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99729 + ... + 100238.

It is an arithmetic number, because the mean of its divisors is an integer number (5399136).

Almost surely, 2^50991585 is an apocalyptic number.

It is an amenable number.

50991585 is a deficient number, since it is larger than the sum of its proper divisors (35394591).

50991585 is a wasteful number, since it uses less digits than its factorization.

50991585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199992.

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 50991585 is about 7140.8392363923. The cubic root of 50991585 is about 370.8225794410.

The spelling of 50991585 in words is "fifty million, nine hundred ninety-one thousand, five hundred eighty-five".