47847991 has 4 divisors (see below), whose sum is σ = 47903184. Its totient is φ = 47792800.

The previous prime is 47847937. The next prime is 47848001. The reversal of 47847991 is 19974874.

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

It is a cyclic number.

It is not a de Polignac number, because 47847991 - 2⁹ = 47847479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47847931) 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, 26275 + ... + 28036.

It is an arithmetic number, because the mean of its divisors is an integer number (11975796).

Almost surely, 2^47847991 is an apocalyptic number.

47847991 is a deficient number, since it is larger than the sum of its proper divisors (55193).

47847991 is an equidigital number, since it uses as much as digits as its factorization.

47847991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55192.

The product of its digits is 508032, while the sum is 49.

The square root of 47847991 is about 6917.2242265232. The cubic root of 47847991 is about 363.0400758168.

The spelling of 47847991 in words is "forty-seven million, eight hundred forty-seven thousand, nine hundred ninety-one".