47943281 has 4 divisors (see below), whose sum is σ = 50763492. Its totient is φ = 45123072.

The previous prime is 47943277. The next prime is 47943319. The reversal of 47943281 is 18234974.

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 39187600 + 8755681 = 6260^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 47943281 - 2² = 47943277 is a prime.

It is a super-2 number, since 2×47943281² = 4597116386089922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47943221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410080 + ... + 1410113.

It is an arithmetic number, because the mean of its divisors is an integer number (12690873).

Almost surely, 2^47943281 is an apocalyptic number.

It is an amenable number.

47943281 is a deficient number, since it is larger than the sum of its proper divisors (2820211).

47943281 is a wasteful number, since it uses less digits than its factorization.

47943281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820210.

The product of its digits is 48384, while the sum is 38.

The square root of 47943281 is about 6924.1086791009. The cubic root of 47943281 is about 363.2809159482.

The spelling of 47943281 in words is "forty-seven million, nine hundred forty-three thousand, two hundred eighty-one".