71090871 has 4 divisors (see below), whose sum is σ = 94787832. Its totient is φ = 47393912.

The previous prime is 71090869. The next prime is 71090881. The reversal of 71090871 is 17809017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17809017 = 3 ⋅5936339.

It is a cyclic number.

It is not a de Polignac number, because 71090871 - 2¹ = 71090869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71090881) 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, 11848476 + ... + 11848481.

It is an arithmetic number, because the mean of its divisors is an integer number (23696958).

Almost surely, 2^71090871 is an apocalyptic number.

71090871 is a deficient number, since it is larger than the sum of its proper divisors (23696961).

71090871 is a wasteful number, since it uses less digits than its factorization.

71090871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23696960.

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 71090871 is about 8431.5402507490. The cubic root of 71090871 is about 414.2583570237.

Adding to 71090871 its reverse (17809017), we get a palindrome (88899888).

The spelling of 71090871 in words is "seventy-one million, ninety thousand, eight hundred seventy-one".