71921291 has 8 divisors (see below), whose sum is σ = 77804160. Its totient is φ = 66088512.

The previous prime is 71921287. The next prime is 71921359. The reversal of 71921291 is 19212917.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71921291 - 2² = 71921287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71921221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9506 + ... + 15303.

It is an arithmetic number, because the mean of its divisors is an integer number (9725520).

Almost surely, 2^71921291 is an apocalyptic number.

71921291 is a deficient number, since it is larger than the sum of its proper divisors (5882869).

71921291 is a wasteful number, since it uses less digits than its factorization.

71921291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25045.

The product of its digits is 2268, while the sum is 32.

The square root of 71921291 is about 8480.6421337066. The cubic root of 71921291 is about 415.8651155244.

The spelling of 71921291 in words is "seventy-one million, nine hundred twenty-one thousand, two hundred ninety-one".