71111121 has 16 divisors (see below), whose sum is σ = 97320960. Its totient is φ = 46161360.

The previous prime is 71111113. The next prime is 71111137. The reversal of 71111121 is 12111117.

It is not a de Polignac number, because 71111121 - 2³ = 71111113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71111121.

It is not an unprimeable number, because it can be changed into a prime (71111111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54960 + ... + 56238.

It is an arithmetic number, because the mean of its divisors is an integer number (6082560).

Almost surely, 2^71111121 is an apocalyptic number.

It is an amenable number.

71111121 is a deficient number, since it is larger than the sum of its proper divisors (26209839).

71111121 is a wasteful number, since it uses less digits than its factorization.

71111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its digits is 14, while the sum is 15.

The square root of 71111121 is about 8432.7410134546. The cubic root of 71111121 is about 414.2976866649.

Adding to 71111121 its reverse (12111117), we get a palindrome (83222238).

The spelling of 71111121 in words is "seventy-one million, one hundred eleven thousand, one hundred twenty-one".