47639521 has 4 divisors (see below), whose sum is σ = 47931952. Its totient is φ = 47347092.

The previous prime is 47639483. The next prime is 47639531. The reversal of 47639521 is 12593674.

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.

It is a cyclic number.

It is not a de Polignac number, because 47639521 - 2⁷ = 47639393 is a prime.

It is a super-2 number, since 2×47639521² = 4539047922218882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47639531) 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, 145971 + ... + 146296.

It is an arithmetic number, because the mean of its divisors is an integer number (11982988).

Almost surely, 2^47639521 is an apocalyptic number.

It is an amenable number.

47639521 is a deficient number, since it is larger than the sum of its proper divisors (292431).

47639521 is a wasteful number, since it uses less digits than its factorization.

47639521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292430.

The product of its digits is 45360, while the sum is 37.

The square root of 47639521 is about 6902.1388713934. The cubic root of 47639521 is about 362.5120623810.

The spelling of 47639521 in words is "forty-seven million, six hundred thirty-nine thousand, five hundred twenty-one".