71149721 has 2 divisors, whose sum is σ = 71149722. Its totient is φ = 71149720.

The previous prime is 71149703. The next prime is 71149733. The reversal of 71149721 is 12794117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70375321 + 774400 = 8389^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 71149721 - 2⁶ = 71149657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71149751) 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 as a sum of consecutive naturals, namely, 35574860 + 35574861.

It is an arithmetic number, because the mean of its divisors is an integer number (35574861).

Almost surely, 2^71149721 is an apocalyptic number.

It is an amenable number.

71149721 is a deficient number, since it is larger than the sum of its proper divisors (1).

71149721 is an equidigital number, since it uses as much as digits as its factorization.

71149721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 32.

The square root of 71149721 is about 8435.0294012528. The cubic root of 71149721 is about 414.3726350829.

The spelling of 71149721 in words is "seventy-one million, one hundred forty-nine thousand, seven hundred twenty-one".