71140609 has 2 divisors, whose sum is σ = 71140610. Its totient is φ = 71140608.

The previous prime is 71140591. The next prime is 71140621. The reversal of 71140609 is 90604117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36566209 + 34574400 = 6047^2 + 5880^2 .

It is a cyclic number.

It is not a de Polignac number, because 71140609 - 2⁵ = 71140577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71140639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35570304 + 35570305.

It is an arithmetic number, because the mean of its divisors is an integer number (35570305).

Almost surely, 2^71140609 is an apocalyptic number.

It is an amenable number.

71140609 is a deficient number, since it is larger than the sum of its proper divisors (1).

71140609 is an equidigital number, since it uses as much as digits as its factorization.

71140609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 71140609 is about 8434.4892554321. The cubic root of 71140609 is about 414.3549450409.

The spelling of 71140609 in words is "seventy-one million, one hundred forty thousand, six hundred nine".