71315549 has 2 divisors, whose sum is σ = 71315550. Its totient is φ = 71315548.

The previous prime is 71315507. The next prime is 71315557. The reversal of 71315549 is 94551317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37884025 + 33431524 = 6155^2 + 5782^2 .

It is a cyclic number.

It is not a de Polignac number, because 71315549 - 2¹² = 71311453 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 (71315599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35657774 + 35657775.

It is an arithmetic number, because the mean of its divisors is an integer number (35657775).

Almost surely, 2^71315549 is an apocalyptic number.

It is an amenable number.

71315549 is a deficient number, since it is larger than the sum of its proper divisors (1).

71315549 is an equidigital number, since it uses as much as digits as its factorization.

71315549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 35.

The square root of 71315549 is about 8444.8534031089. The cubic root of 71315549 is about 414.6943101329.

The spelling of 71315549 in words is "seventy-one million, three hundred fifteen thousand, five hundred forty-nine".