47972161 has 4 divisors (see below), whose sum is σ = 48117424. Its totient is φ = 47826900.

The previous prime is 47972153. The next prime is 47972167. The reversal of 47972161 is 16127974.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16127974 = 2 ⋅8063987.

It is a cyclic number.

It is not a de Polignac number, because 47972161 - 2³ = 47972153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47972161.

It is not an unprimeable number, because it can be changed into a prime (47972167) 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, 72135 + ... + 72796.

It is an arithmetic number, because the mean of its divisors is an integer number (12029356).

Almost surely, 2^47972161 is an apocalyptic number.

It is an amenable number.

47972161 is a deficient number, since it is larger than the sum of its proper divisors (145263).

47972161 is a wasteful number, since it uses less digits than its factorization.

47972161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145262.

The product of its digits is 21168, while the sum is 37.

The square root of 47972161 is about 6926.1938321130. The cubic root of 47972161 is about 363.3538455066.

The spelling of 47972161 in words is "forty-seven million, nine hundred seventy-two thousand, one hundred sixty-one".