47423521 has 4 divisors (see below), whose sum is σ = 48953344. Its totient is φ = 45893700.

The previous prime is 47423507. The next prime is 47423533. The reversal of 47423521 is 12532474.

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: 12532474 = 2 ⋅6266237.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47423521 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 47423521.

It is not an unprimeable number, because it can be changed into a prime (47423821) 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, 764865 + ... + 764926.

It is an arithmetic number, because the mean of its divisors is an integer number (12238336).

Almost surely, 2^47423521 is an apocalyptic number.

It is an amenable number.

47423521 is a deficient number, since it is larger than the sum of its proper divisors (1529823).

47423521 is a wasteful number, since it uses less digits than its factorization.

47423521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529822.

The product of its digits is 6720, while the sum is 28.

The square root of 47423521 is about 6886.4737710965. The cubic root of 47423521 is about 361.9633495652.

Adding to 47423521 its reverse (12532474), we get a palindrome (59955995).

The spelling of 47423521 in words is "forty-seven million, four hundred twenty-three thousand, five hundred twenty-one".