50991281 has 8 divisors (see below), whose sum is σ = 56570400. Its totient is φ = 45569440.

The previous prime is 50991271. The next prime is 50991289. The reversal of 50991281 is 18219905.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50991281 is a prime.

It is a super-2 number, since 2×50991281² = 5200221476041922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (50991289) 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, 38636 + ... + 39933.

It is an arithmetic number, because the mean of its divisors is an integer number (7071300).

Almost surely, 2^50991281 is an apocalyptic number.

It is an amenable number.

50991281 is a deficient number, since it is larger than the sum of its proper divisors (5579119).

50991281 is a wasteful number, since it uses less digits than its factorization.

50991281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78639.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 50991281 is about 7140.8179503471. The cubic root of 50991281 is about 370.8218425201.

The spelling of 50991281 in words is "fifty million, nine hundred ninety-one thousand, two hundred eighty-one".