82471409 has 8 divisors (see below), whose sum is σ = 85146600. Its totient is φ = 79819776.

The previous prime is 82471393. The next prime is 82471423. The reversal of 82471409 is 90417428.

It can be written as a sum of positive squares in 4 ways, for example, as 41152225 + 41319184 = 6415^2 + 6428^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82471409 - 2⁴ = 82471393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82471009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367 + ... + 12915.

It is an arithmetic number, because the mean of its divisors is an integer number (10643325).

Almost surely, 2^82471409 is an apocalyptic number.

It is an amenable number.

82471409 is a deficient number, since it is larger than the sum of its proper divisors (2675191).

82471409 is a wasteful number, since it uses less digits than its factorization.

82471409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11779.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 82471409 is about 9081.3770431582. The cubic root of 82471409 is about 435.2790898495.

The spelling of 82471409 in words is "eighty-two million, four hundred seventy-one thousand, four hundred nine".