71545261 has 2 divisors, whose sum is σ = 71545262. Its totient is φ = 71545260.

The previous prime is 71545237. The next prime is 71545273. The reversal of 71545261 is 16254517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54686025 + 16859236 = 7395^2 + 4106^2 .

It is a cyclic number.

It is not a de Polignac number, because 71545261 - 2⁹ = 71544749 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 (71525261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35772630 + 35772631.

It is an arithmetic number, because the mean of its divisors is an integer number (35772631).

Almost surely, 2^71545261 is an apocalyptic number.

It is an amenable number.

71545261 is a deficient number, since it is larger than the sum of its proper divisors (1).

71545261 is an equidigital number, since it uses as much as digits as its factorization.

71545261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 71545261 is about 8458.4431782687. The cubic root of 71545261 is about 415.1390853305.

Adding to 71545261 its reverse (16254517), we get a palindrome (87799778).

The spelling of 71545261 in words is "seventy-one million, five hundred forty-five thousand, two hundred sixty-one".