47791009 has 4 divisors (see below), whose sum is σ = 54618304. Its totient is φ = 40963716.

The previous prime is 47790979. The next prime is 47791019. The reversal of 47791009 is 90019774.

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 47791009 - 2¹³ = 47782817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47791019) 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, 3413637 + ... + 3413650.

It is an arithmetic number, because the mean of its divisors is an integer number (13654576).

Almost surely, 2^47791009 is an apocalyptic number.

It is an amenable number.

47791009 is a deficient number, since it is larger than the sum of its proper divisors (6827295).

47791009 is an equidigital number, since it uses as much as digits as its factorization.

47791009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6827294.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 47791009 is about 6913.1041508139. The cubic root of 47791009 is about 362.8959041980.

The spelling of 47791009 in words is "forty-seven million, seven hundred ninety-one thousand, nine".