71271691 has 2 divisors, whose sum is σ = 71271692. Its totient is φ = 71271690.

The previous prime is 71271677. The next prime is 71271709. The reversal of 71271691 is 19617217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71271691 - 2¹⁹ = 70747403 is a prime.

It is not a weakly prime, because it can be changed into another prime (71271601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35635845 + 35635846.

It is an arithmetic number, because the mean of its divisors is an integer number (35635846).

Almost surely, 2^71271691 is an apocalyptic number.

71271691 is a deficient number, since it is larger than the sum of its proper divisors (1).

71271691 is an equidigital number, since it uses as much as digits as its factorization.

71271691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 34.

The square root of 71271691 is about 8442.2562742433. The cubic root of 71271691 is about 414.6092824264.

The spelling of 71271691 in words is "seventy-one million, two hundred seventy-one thousand, six hundred ninety-one".