71601209 has 2 divisors, whose sum is σ = 71601210. Its totient is φ = 71601208.

The previous prime is 71601197. The next prime is 71601217. The reversal of 71601209 is 90210617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71031184 + 570025 = 8428^2 + 755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71601209 is a prime.

It is not a weakly prime, because it can be changed into another prime (71601259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35800604 + 35800605.

It is an arithmetic number, because the mean of its divisors is an integer number (35800605).

Almost surely, 2^71601209 is an apocalyptic number.

It is an amenable number.

71601209 is a deficient number, since it is larger than the sum of its proper divisors (1).

71601209 is an equidigital number, since it uses as much as digits as its factorization.

71601209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 71601209 is about 8461.7497599492. The cubic root of 71601209 is about 415.2472692949.

The spelling of 71601209 in words is "seventy-one million, six hundred one thousand, two hundred nine".