71128459 has 4 divisors (see below), whose sum is σ = 75312504. Its totient is φ = 66944416.

The previous prime is 71128433. The next prime is 71128469. The reversal of 71128459 is 95482117.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71128459 - 2¹⁷ = 70997387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71128469) 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, 2091997 + ... + 2092030.

It is an arithmetic number, because the mean of its divisors is an integer number (18828126).

Almost surely, 2^71128459 is an apocalyptic number.

71128459 is a deficient number, since it is larger than the sum of its proper divisors (4184045).

71128459 is a wasteful number, since it uses less digits than its factorization.

71128459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184044.

The product of its digits is 20160, while the sum is 37.

The square root of 71128459 is about 8433.7689676680. The cubic root of 71128459 is about 414.3313546739.

The spelling of 71128459 in words is "seventy-one million, one hundred twenty-eight thousand, four hundred fifty-nine".