71092321 has 2 divisors, whose sum is σ = 71092322. Its totient is φ = 71092320.

The previous prime is 71092309. The next prime is 71092391. The reversal of 71092321 is 12329017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59120721 + 11971600 = 7689^2 + 3460^2 .

It is an emirp because it is prime and its reverse (12329017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71092321 - 2⁹ = 71091809 is a prime.

It is not a weakly prime, because it can be changed into another prime (71092391) 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 as a sum of consecutive naturals, namely, 35546160 + 35546161.

It is an arithmetic number, because the mean of its divisors is an integer number (35546161).

Almost surely, 2^71092321 is an apocalyptic number.

It is an amenable number.

71092321 is a deficient number, since it is larger than the sum of its proper divisors (1).

71092321 is an equidigital number, since it uses as much as digits as its factorization.

71092321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 71092321 is about 8431.6262369723. The cubic root of 71092321 is about 414.2611734685.

The spelling of 71092321 in words is "seventy-one million, ninety-two thousand, three hundred twenty-one".