71304121 has 4 divisors (see below), whose sum is σ = 81490432. Its totient is φ = 61117812.

The previous prime is 71304109. The next prime is 71304139. The reversal of 71304121 is 12140317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 71304121 - 2⁷ = 71303993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71304521) 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, 5093145 + ... + 5093158.

It is an arithmetic number, because the mean of its divisors is an integer number (20372608).

Almost surely, 2^71304121 is an apocalyptic number.

It is an amenable number.

71304121 is a deficient number, since it is larger than the sum of its proper divisors (10186311).

71304121 is a wasteful number, since it uses less digits than its factorization.

71304121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186310.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 71304121 is about 8444.1767508739. The cubic root of 71304121 is about 414.6721579758.

Adding to 71304121 its reverse (12140317), we get a palindrome (83444438).

The spelling of 71304121 in words is "seventy-one million, three hundred four thousand, one hundred twenty-one".