71608261 has 2 divisors, whose sum is σ = 71608262. Its totient is φ = 71608260.

The previous prime is 71608253. The next prime is 71608367. The reversal of 71608261 is 16280617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69205761 + 2402500 = 8319^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 71608261 - 2³ = 71608253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71608231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35804130 + 35804131.

It is an arithmetic number, because the mean of its divisors is an integer number (35804131).

Almost surely, 2^71608261 is an apocalyptic number.

It is an amenable number.

71608261 is a deficient number, since it is larger than the sum of its proper divisors (1).

71608261 is an equidigital number, since it uses as much as digits as its factorization.

71608261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 71608261 is about 8462.1664483748. The cubic root of 71608261 is about 415.2609014093.

Adding to 71608261 its reverse (16280617), we get a palindrome (87888878).

The spelling of 71608261 in words is "seventy-one million, six hundred eight thousand, two hundred sixty-one".