47657221 has 4 divisors (see below), whose sum is σ = 48945292. Its totient is φ = 46369152.

The previous prime is 47657213. The next prime is 47657227. The reversal of 47657221 is 12275674.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12275674 = 2 ⋅6137837.

It can be written as a sum of positive squares in 2 ways, for example, as 21288996 + 26368225 = 4614^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 47657221 - 2³ = 47657213 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 (47657227) 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, 643980 + ... + 644053.

It is an arithmetic number, because the mean of its divisors is an integer number (12236323).

Almost surely, 2^47657221 is an apocalyptic number.

It is an amenable number.

47657221 is a deficient number, since it is larger than the sum of its proper divisors (1288071).

47657221 is a wasteful number, since it uses less digits than its factorization.

47657221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288070.

The product of its digits is 23520, while the sum is 34.

The square root of 47657221 is about 6903.4209635513. The cubic root of 47657221 is about 362.5569527639.

The spelling of 47657221 in words is "forty-seven million, six hundred fifty-seven thousand, two hundred twenty-one".