47447251 has 4 divisors (see below), whose sum is σ = 47461392. Its totient is φ = 47433112.

The previous prime is 47447249. The next prime is 47447261. The reversal of 47447251 is 15274474.

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 is a cyclic number.

It is not a de Polignac number, because 47447251 - 2¹ = 47447249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47447201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1146 + ... + 9808.

It is an arithmetic number, because the mean of its divisors is an integer number (11865348).

Almost surely, 2^47447251 is an apocalyptic number.

47447251 is a deficient number, since it is larger than the sum of its proper divisors (14141).

47447251 is an equidigital number, since it uses as much as digits as its factorization.

47447251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14140.

The product of its digits is 31360, while the sum is 34.

The square root of 47447251 is about 6888.1964983586. The cubic root of 47447251 is about 362.0237131277.

The spelling of 47447251 in words is "forty-seven million, four hundred forty-seven thousand, two hundred fifty-one".