47121281 has 4 divisors (see below), whose sum is σ = 47766852. Its totient is φ = 46475712.

The previous prime is 47121253. The next prime is 47121329. The reversal of 47121281 is 18212174.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36493681 + 10627600 = 6041^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 47121281 - 2¹⁰ = 47120257 is a prime.

It is a super-2 number, since 2×47121281² = 4440830246161922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 47121281.

It is not an unprimeable number, because it can be changed into a prime (47121241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322676 + ... + 322821.

It is an arithmetic number, because the mean of its divisors is an integer number (11941713).

Almost surely, 2^47121281 is an apocalyptic number.

It is an amenable number.

47121281 is a deficient number, since it is larger than the sum of its proper divisors (645571).

47121281 is an equidigital number, since it uses as much as digits as its factorization.

47121281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645570.

The product of its digits is 896, while the sum is 26.

The square root of 47121281 is about 6864.4942275451. The cubic root of 47121281 is about 361.1927541861.

The spelling of 47121281 in words is "forty-seven million, one hundred twenty-one thousand, two hundred eighty-one".