47821911 has 4 divisors (see below), whose sum is σ = 63762552. Its totient is φ = 31881272.

The previous prime is 47821909. The next prime is 47821931. The reversal of 47821911 is 11912874.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 47821911 - 2¹ = 47821909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47821931) 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, 7970316 + ... + 7970321.

It is an arithmetic number, because the mean of its divisors is an integer number (15940638).

Almost surely, 2^47821911 is an apocalyptic number.

47821911 is a deficient number, since it is larger than the sum of its proper divisors (15940641).

47821911 is a wasteful number, since it uses less digits than its factorization.

47821911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15940640.

The product of its digits is 4032, while the sum is 33.

The square root of 47821911 is about 6915.3388203327. The cubic root of 47821911 is about 362.9741043537.

The spelling of 47821911 in words is "forty-seven million, eight hundred twenty-one thousand, nine hundred eleven".