71005691 has 2 divisors, whose sum is σ = 71005692. Its totient is φ = 71005690.

The previous prime is 71005687. The next prime is 71005699. The reversal of 71005691 is 19650017.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71005691 - 2² = 71005687 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71005699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35502845 + 35502846.

It is an arithmetic number, because the mean of its divisors is an integer number (35502846).

Almost surely, 2^71005691 is an apocalyptic number.

71005691 is a deficient number, since it is larger than the sum of its proper divisors (1).

71005691 is an equidigital number, since it uses as much as digits as its factorization.

71005691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 71005691 is about 8426.4874651304. The cubic root of 71005691 is about 414.0928382119.

The spelling of 71005691 in words is "seventy-one million, five thousand, six hundred ninety-one".