71251121 has 8 divisors (see below), whose sum is σ = 75079200. Its totient is φ = 67430880.

The previous prime is 71251109. The next prime is 71251123. The reversal of 71251121 is 12115217.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71251121 is a prime.

It is a super-3 number, since 3×71251121³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71251093 and 71251102.

It is not an unprimeable number, because it can be changed into a prime (71251123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31610 + ... + 33788.

It is an arithmetic number, because the mean of its divisors is an integer number (9384900).

Almost surely, 2^71251121 is an apocalyptic number.

It is an amenable number.

71251121 is a deficient number, since it is larger than the sum of its proper divisors (3828079).

71251121 is a wasteful number, since it uses less digits than its factorization.

71251121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3919.

The product of its digits is 140, while the sum is 20.

The square root of 71251121 is about 8441.0379101151. The cubic root of 71251121 is about 414.5693912558.

Adding to 71251121 its reverse (12115217), we get a palindrome (83366338).

The spelling of 71251121 in words is "seventy-one million, two hundred fifty-one thousand, one hundred twenty-one".