71390111 has 4 divisors (see below), whose sum is σ = 76881672. Its totient is φ = 65898552.

The previous prime is 71390107. The next prime is 71390113. The reversal of 71390111 is 11109317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11109317 = 1987 ⋅5591.

It is a cyclic number.

It is not a de Polignac number, because 71390111 - 2² = 71390107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71390113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2745761 + ... + 2745786.

It is an arithmetic number, because the mean of its divisors is an integer number (19220418).

Almost surely, 2^71390111 is an apocalyptic number.

71390111 is a deficient number, since it is larger than the sum of its proper divisors (5491561).

71390111 is a wasteful number, since it uses less digits than its factorization.

71390111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491560.

The product of its (nonzero) digits is 189, while the sum is 23.

The square root of 71390111 is about 8449.2668912752. The cubic root of 71390111 is about 414.8387838503.

Adding to 71390111 its reverse (11109317), we get a palindrome (82499428).

The spelling of 71390111 in words is "seventy-one million, three hundred ninety thousand, one hundred eleven".