471985409 has 4 divisors (see below), whose sum is σ = 539411904. Its totient is φ = 404558916.

The previous prime is 471985391. The next prime is 471985417. The reversal of 471985409 is 904589174.

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: 904589174 = 2 ⋅452294587.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-471985409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (471985429) 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, 33713237 + ... + 33713250.

It is an arithmetic number, because the mean of its divisors is an integer number (134852976).

Almost surely, 2^471985409 is an apocalyptic number.

It is an amenable number.

471985409 is a deficient number, since it is larger than the sum of its proper divisors (67426495).

471985409 is an equidigital number, since it uses as much as digits as its factorization.

471985409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67426494.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 471985409 is about 21725.2251771990. The cubic root of 471985409 is about 778.5912601102.

The spelling of 471985409 in words is "four hundred seventy-one million, nine hundred eighty-five thousand, four hundred nine".