71921085 has 16 divisors (see below), whose sum is σ = 118786560. Its totient is φ = 37120320.

The previous prime is 71921063. The next prime is 71921123. The reversal of 71921085 is 58012917.

It is not a de Polignac number, because 71921085 - 2¹⁰ = 71920061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76870 + ... + 77799.

It is an arithmetic number, because the mean of its divisors is an integer number (7424160).

Almost surely, 2^71921085 is an apocalyptic number.

It is an amenable number.

71921085 is a deficient number, since it is larger than the sum of its proper divisors (46865475).

71921085 is a wasteful number, since it uses less digits than its factorization.

71921085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154708.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 71921085 is about 8480.6299883912. The cubic root of 71921085 is about 415.8647184779.

The spelling of 71921085 in words is "seventy-one million, nine hundred twenty-one thousand, eighty-five".