71258121 has 12 divisors (see below), whose sum is σ = 112285680. Its totient is φ = 43186680.

The previous prime is 71258107. The next prime is 71258137. The reversal of 71258121 is 12185217.

It is not a de Polignac number, because 71258121 - 2¹⁰ = 71257097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71258171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359791 + ... + 359988.

It is an arithmetic number, because the mean of its divisors is an integer number (9357140).

Almost surely, 2^71258121 is an apocalyptic number.

It is an amenable number.

71258121 is a deficient number, since it is larger than the sum of its proper divisors (41027559).

71258121 is a wasteful number, since it uses less digits than its factorization.

71258121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719796 (or 719793 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 71258121 is about 8441.4525408842. The cubic root of 71258121 is about 414.5829671391.

The spelling of 71258121 in words is "seventy-one million, two hundred fifty-eight thousand, one hundred twenty-one".