71056121 has 4 divisors (see below), whose sum is σ = 71102592. Its totient is φ = 71009652.

The previous prime is 71056109. The next prime is 71056129. The reversal of 71056121 is 12165017.

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 a cyclic number.

It is not a de Polignac number, because 71056121 - 2¹⁰ = 71055097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71056129) 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, 20861 + ... + 24026.

It is an arithmetic number, because the mean of its divisors is an integer number (17775648).

Almost surely, 2^71056121 is an apocalyptic number.

It is an amenable number.

71056121 is a deficient number, since it is larger than the sum of its proper divisors (46471).

71056121 is a wasteful number, since it uses less digits than its factorization.

71056121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46470.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 71056121 is about 8429.4792840365. The cubic root of 71056121 is about 414.1908480084.

The spelling of 71056121 in words is "seventy-one million, fifty-six thousand, one hundred twenty-one".