47550721 has 4 divisors (see below), whose sum is σ = 47584944. Its totient is φ = 47516500.

The previous prime is 47550719. The next prime is 47550757. The reversal of 47550721 is 12705574.

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 47550721 - 2¹ = 47550719 is a prime.

It is a super-2 number, since 2×47550721² = 4522142135239682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47550791) 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, 14935 + ... + 17836.

It is an arithmetic number, because the mean of its divisors is an integer number (11896236).

Almost surely, 2^47550721 is an apocalyptic number.

It is an amenable number.

47550721 is a deficient number, since it is larger than the sum of its proper divisors (34223).

47550721 is a wasteful number, since it uses less digits than its factorization.

47550721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34222.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 47550721 is about 6895.7030823550. The cubic root of 47550721 is about 362.2866816287.

The spelling of 47550721 in words is "forty-seven million, five hundred fifty thousand, seven hundred twenty-one".