47775971 has 4 divisors (see below), whose sum is σ = 48448944. Its totient is φ = 47103000.

The previous prime is 47775943. The next prime is 47775977. The reversal of 47775971 is 17957774.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47775971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47775977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336380 + ... + 336521.

It is an arithmetic number, because the mean of its divisors is an integer number (12112236).

Almost surely, 2^47775971 is an apocalyptic number.

47775971 is a deficient number, since it is larger than the sum of its proper divisors (672973).

47775971 is an equidigital number, since it uses as much as digits as its factorization.

47775971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672972.

The product of its digits is 432180, while the sum is 47.

The square root of 47775971 is about 6912.0164206981. The cubic root of 47775971 is about 362.8578370579.

The spelling of 47775971 in words is "forty-seven million, seven hundred seventy-five thousand, nine hundred seventy-one".