47817971 has 4 divisors (see below), whose sum is σ = 47833632. Its totient is φ = 47802312.

The previous prime is 47817937. The next prime is 47817977. The reversal of 47817971 is 17971874.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17971874 = 2 ⋅8985937.

It is a cyclic number.

It is not a de Polignac number, because 47817971 - 2²² = 43623667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47817977) 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, 1595 + ... + 9908.

It is an arithmetic number, because the mean of its divisors is an integer number (11958408).

Almost surely, 2^47817971 is an apocalyptic number.

47817971 is a deficient number, since it is larger than the sum of its proper divisors (15661).

47817971 is a wasteful number, since it uses less digits than its factorization.

47817971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15660.

The product of its digits is 98784, while the sum is 44.

The square root of 47817971 is about 6915.0539404982. The cubic root of 47817971 is about 362.9641357207.

The spelling of 47817971 in words is "forty-seven million, eight hundred seventeen thousand, nine hundred seventy-one".