47089981 has 4 divisors (see below), whose sum is σ = 47104092. Its totient is φ = 47075872.

The previous prime is 47089979. The next prime is 47090027. The reversal of 47089981 is 18998074.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3080025 + 44009956 = 1755^2 + 6634^2 .

It is a cyclic number.

It is not a de Polignac number, because 47089981 - 2¹ = 47089979 is a prime.

It is a super-2 number, since 2×47089981² = 4434932621160722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47084981) 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, 1071 + ... + 9763.

It is an arithmetic number, because the mean of its divisors is an integer number (11776023).

Almost surely, 2^47089981 is an apocalyptic number.

It is an amenable number.

47089981 is a deficient number, since it is larger than the sum of its proper divisors (14111).

47089981 is an equidigital number, since it uses as much as digits as its factorization.

47089981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14110.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 47089981 is about 6862.2140013264. The cubic root of 47089981 is about 361.1127631711.

The spelling of 47089981 in words is "forty-seven million, eighty-nine thousand, nine hundred eighty-one".