71113121 has 4 divisors (see below), whose sum is σ = 72454932. Its totient is φ = 69771312.

The previous prime is 71113111. The next prime is 71113183. The reversal of 71113121 is 12131117.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48455521 + 22657600 = 6961^2 + 4760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71113121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71113121.

It is not an unprimeable number, because it can be changed into a prime (71113111) 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, 670826 + ... + 670931.

It is an arithmetic number, because the mean of its divisors is an integer number (18113733).

Almost surely, 2^71113121 is an apocalyptic number.

It is an amenable number.

71113121 is a deficient number, since it is larger than the sum of its proper divisors (1341811).

71113121 is a wasteful number, since it uses less digits than its factorization.

71113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341810.

The product of its digits is 42, while the sum is 17.

The square root of 71113121 is about 8432.8595980249. The cubic root of 71113121 is about 414.3015706688.

Adding to 71113121 its reverse (12131117), we get a palindrome (83244238).

The spelling of 71113121 in words is "seventy-one million, one hundred thirteen thousand, one hundred twenty-one".