71223609 has 16 divisors (see below), whose sum is σ = 102291200. Its totient is φ = 43935696.

The previous prime is 71223599. The next prime is 71223611. The reversal of 71223609 is 90632217.

It is not a de Polignac number, because 71223609 - 2¹⁷ = 71092537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71223619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12079 + ... + 16980.

It is an arithmetic number, because the mean of its divisors is an integer number (6393200).

Almost surely, 2^71223609 is an apocalyptic number.

It is an amenable number.

71223609 is a deficient number, since it is larger than the sum of its proper divisors (31067591).

71223609 is a wasteful number, since it uses less digits than its factorization.

71223609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29124.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 71223609 is about 8439.4080953583. The cubic root of 71223609 is about 414.5160255391.

It can be divided in two parts, 7122 and 3609, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 71223609 in words is "seventy-one million, two hundred twenty-three thousand, six hundred nine".