71530397 has 2 divisors, whose sum is σ = 71530398. Its totient is φ = 71530396.

The previous prime is 71530387. The next prime is 71530409. The reversal of 71530397 is 79303517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54007801 + 17522596 = 7349^2 + 4186^2 .

It is a cyclic number.

It is not a de Polignac number, because 71530397 - 2¹⁰ = 71529373 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 (71530367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35765198 + 35765199.

It is an arithmetic number, because the mean of its divisors is an integer number (35765199).

Almost surely, 2^71530397 is an apocalyptic number.

It is an amenable number.

71530397 is a deficient number, since it is larger than the sum of its proper divisors (1).

71530397 is an equidigital number, since it uses as much as digits as its factorization.

71530397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19845, while the sum is 35.

The square root of 71530397 is about 8457.5644839398. The cubic root of 71530397 is about 415.1103340447.

The spelling of 71530397 in words is "seventy-one million, five hundred thirty thousand, three hundred ninety-seven".