71473009 has 4 divisors (see below), whose sum is σ = 73135216. Its totient is φ = 69810804.

The previous prime is 71472997. The next prime is 71473019. The reversal of 71473009 is 90037417.

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 71473009 - 2⁹ = 71472497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71473019) 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, 831039 + ... + 831124.

It is an arithmetic number, because the mean of its divisors is an integer number (18283804).

Almost surely, 2^71473009 is an apocalyptic number.

It is an amenable number.

71473009 is a deficient number, since it is larger than the sum of its proper divisors (1662207).

71473009 is a wasteful number, since it uses less digits than its factorization.

71473009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662206.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 71473009 is about 8454.1711007053. The cubic root of 71473009 is about 414.9992916231. Note that the first 3 decimals are identical.

The spelling of 71473009 in words is "seventy-one million, four hundred seventy-three thousand, nine".