47278981 has 4 divisors (see below), whose sum is σ = 47503264. Its totient is φ = 47054700.

The previous prime is 47278967. The next prime is 47279033. The reversal of 47278981 is 18987274.

47278981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47278981 - 2⁵ = 47278949 is a prime.

It is a super-2 number, since 2×47278981² = 4470604088796722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47278901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111825 + ... + 112246.

It is an arithmetic number, because the mean of its divisors is an integer number (11875816).

Almost surely, 2^47278981 is an apocalyptic number.

It is an amenable number.

47278981 is a deficient number, since it is larger than the sum of its proper divisors (224283).

47278981 is a wasteful number, since it uses less digits than its factorization.

47278981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224282.

The product of its digits is 225792, while the sum is 46.

The square root of 47278981 is about 6875.9712768452. The cubic root of 47278981 is about 361.5952380995.

The spelling of 47278981 in words is "forty-seven million, two hundred seventy-eight thousand, nine hundred eighty-one".