71112911 has 4 divisors (see below), whose sum is σ = 71238024. Its totient is φ = 70987800.

The previous prime is 71112871. The next prime is 71112913. The reversal of 71112911 is 11921117.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71112911 is a prime.

It is a super-2 number, since 2×71112911² = 10114092221787842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71112913) 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, 61700 + ... + 62841.

It is an arithmetic number, because the mean of its divisors is an integer number (17809506).

Almost surely, 2^71112911 is an apocalyptic number.

71112911 is a deficient number, since it is larger than the sum of its proper divisors (125113).

71112911 is a wasteful number, since it uses less digits than its factorization.

71112911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125112.

The product of its digits is 126, while the sum is 23.

The square root of 71112911 is about 8432.8471467233. The cubic root of 71112911 is about 414.3011628518.

The spelling of 71112911 in words is "seventy-one million, one hundred twelve thousand, nine hundred eleven".