71353561 has 2 divisors, whose sum is σ = 71353562. Its totient is φ = 71353560.

The previous prime is 71353519. The next prime is 71353577. The reversal of 71353561 is 16535317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69806025 + 1547536 = 8355^2 + 1244^2 .

It is an emirp because it is prime and its reverse (16535317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71353561 - 2⁷ = 71353433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71351561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35676780 + 35676781.

It is an arithmetic number, because the mean of its divisors is an integer number (35676781).

Almost surely, 2^71353561 is an apocalyptic number.

It is an amenable number.

71353561 is a deficient number, since it is larger than the sum of its proper divisors (1).

71353561 is an equidigital number, since it uses as much as digits as its factorization.

71353561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9450, while the sum is 31.

The square root of 71353561 is about 8447.1037048210. The cubic root of 71353561 is about 414.7679759766.

Adding to 71353561 its reverse (16535317), we get a palindrome (87888878).

The spelling of 71353561 in words is "seventy-one million, three hundred fifty-three thousand, five hundred sixty-one".