71303121 has 6 divisors (see below), whose sum is σ = 102993410. Its totient is φ = 47535408.

The previous prime is 71303101. The next prime is 71303129. The reversal of 71303121 is 12130317.

It can be written as a sum of positive squares in only one way, i.e., 65028096 + 6275025 = 8064^2 + 2505^2 .

It is not a de Polignac number, because 71303121 - 2¹³ = 71294929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71303094 and 71303103.

It is not an unprimeable number, because it can be changed into a prime (71303129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3961276 + ... + 3961293.

Almost surely, 2^71303121 is an apocalyptic number.

It is an amenable number.

71303121 is a deficient number, since it is larger than the sum of its proper divisors (31690289).

71303121 is a wasteful number, since it uses less digits than its factorization.

71303121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7922575 (or 7922572 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 71303121 is about 8444.1175382630. The cubic root of 71303121 is about 414.6702194525.

Adding to 71303121 its reverse (12130317), we get a palindrome (83433438).

The spelling of 71303121 in words is "seventy-one million, three hundred three thousand, one hundred twenty-one".