71111113 has 2 divisors, whose sum is σ = 71111114. Its totient is φ = 71111112.

The previous prime is 71111111. The next prime is 71111137. The reversal of 71111113 is 31111117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55532304 + 15578809 = 7452^2 + 3947^2 .

It is a cyclic number.

It is not a de Polignac number, because 71111113 - 2¹ = 71111111 is a prime.

Together with 71111111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71111111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35555556 + 35555557.

It is an arithmetic number, because the mean of its divisors is an integer number (35555557).

Almost surely, 2^71111113 is an apocalyptic number.

It is an amenable number.

71111113 is a deficient number, since it is larger than the sum of its proper divisors (1).

71111113 is an equidigital number, since it uses as much as digits as its factorization.

71111113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21, while the sum is 16.

The square root of 71111113 is about 8432.7405391130. The cubic root of 71111113 is about 414.2976711288.

The spelling of 71111113 in words is "seventy-one million, one hundred eleven thousand, one hundred thirteen".