71271905 has 16 divisors (see below), whose sum is σ = 90802944. Its totient is φ = 53518080.

The previous prime is 71271901. The next prime is 71271919. The reversal of 71271905 is 50917217.

It is not a de Polignac number, because 71271905 - 2² = 71271901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71271901) 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, 38450 + ... + 40260.

It is an arithmetic number, because the mean of its divisors is an integer number (5675184).

Almost surely, 2^71271905 is an apocalyptic number.

It is an amenable number.

71271905 is a deficient number, since it is larger than the sum of its proper divisors (19531039).

71271905 is a wasteful number, since it uses less digits than its factorization.

71271905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 71271905 is about 8442.2689485706. The cubic root of 71271905 is about 414.6096973939.

The spelling of 71271905 in words is "seventy-one million, two hundred seventy-one thousand, nine hundred five".