71858261 has 2 divisors, whose sum is σ = 71858262. Its totient is φ = 71858260.

The previous prime is 71858249. The next prime is 71858273. The reversal of 71858261 is 16285817.

It is a balanced prime because it is at equal distance from previous prime (71858249) and next prime (71858273).

It can be written as a sum of positive squares in only one way, i.e., 54302161 + 17556100 = 7369^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 71858261 - 2⁶ = 71858197 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71858221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35929130 + 35929131.

It is an arithmetic number, because the mean of its divisors is an integer number (35929131).

Almost surely, 2^71858261 is an apocalyptic number.

It is an amenable number.

71858261 is a deficient number, since it is larger than the sum of its proper divisors (1).

71858261 is an equidigital number, since it uses as much as digits as its factorization.

71858261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 38.

The square root of 71858261 is about 8476.9252090602. The cubic root of 71858261 is about 415.7435954628.

The spelling of 71858261 in words is "seventy-one million, eight hundred fifty-eight thousand, two hundred sixty-one".