71128997 has 2 divisors, whose sum is σ = 71128998. Its totient is φ = 71128996.

The previous prime is 71128991. The next prime is 71129077. The reversal of 71128997 is 79982117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50779876 + 20349121 = 7126^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 71128997 - 2⁶ = 71128933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71128991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35564498 + 35564499.

It is an arithmetic number, because the mean of its divisors is an integer number (35564499).

Almost surely, 2^71128997 is an apocalyptic number.

It is an amenable number.

71128997 is a deficient number, since it is larger than the sum of its proper divisors (1).

71128997 is an equidigital number, since it uses as much as digits as its factorization.

71128997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 44.

The square root of 71128997 is about 8433.8008631933. The cubic root of 71128997 is about 414.3323993084.

The spelling of 71128997 in words is "seventy-one million, one hundred twenty-eight thousand, nine hundred ninety-seven".