71016991 has 2 divisors, whose sum is σ = 71016992. Its totient is φ = 71016990.

The previous prime is 71016977. The next prime is 71017057. The reversal of 71016991 is 19961017.

It is a weak prime.

It is an emirp because it is prime and its reverse (19961017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71016991 - 2²⁵ = 37462559 is a prime.

It is a super-3 number, since 3×71016991³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71016941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35508495 + 35508496.

It is an arithmetic number, because the mean of its divisors is an integer number (35508496).

Almost surely, 2^71016991 is an apocalyptic number.

71016991 is a deficient number, since it is larger than the sum of its proper divisors (1).

71016991 is an equidigital number, since it uses as much as digits as its factorization.

71016991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 34.

The square root of 71016991 is about 8427.1579432214. The cubic root of 71016991 is about 414.1148035915.

The spelling of 71016991 in words is "seventy-one million, sixteen thousand, nine hundred ninety-one".