71133309 has 40 divisors (see below), whose sum is σ = 117170592. Its totient is φ = 42729120.

The previous prime is 71133263. The next prime is 71133311. The reversal of 71133309 is 90333117.

It is not a de Polignac number, because 71133309 - 2⁸ = 71133053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71133329) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 44494 + ... + 46064.

Almost surely, 2^71133309 is an apocalyptic number.

It is an amenable number.

71133309 is a deficient number, since it is larger than the sum of its proper divisors (46037283).

71133309 is a wasteful number, since it uses less digits than its factorization.

71133309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1630 counting only the distinct ones).

The product of its (nonzero) digits is 1701, while the sum is 27.

The square root of 71133309 is about 8434.0564973208. The cubic root of 71133309 is about 414.3407717269.

The spelling of 71133309 in words is "seventy-one million, one hundred thirty-three thousand, three hundred nine".