921170071 has 4 divisors (see below), whose sum is σ = 921595000. Its totient is φ = 920745144.

The previous prime is 921170039. The next prime is 921170087. The reversal of 921170071 is 170071129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170071129 = 37 ⋅4596517.

It is a cyclic number.

It is not a de Polignac number, because 921170071 - 2⁵ = 921170039 is a prime.

It is a super-2 number, since 2×921170071² = 1697108599412290082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921570071) 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 3 ways as a sum of consecutive naturals, for example, 209196 + ... + 213553.

It is an arithmetic number, because the mean of its divisors is an integer number (230398750).

Almost surely, 2^921170071 is an apocalyptic number.

921170071 is a deficient number, since it is larger than the sum of its proper divisors (424929).

921170071 is a wasteful number, since it uses less digits than its factorization.

921170071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424928.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 921170071 is about 30350.7836966362. The cubic root of 921170071 is about 973.0009696535. Note that the first 3 decimals are identical.

The spelling of 921170071 in words is "nine hundred twenty-one million, one hundred seventy thousand, seventy-one".