71609141 has 2 divisors, whose sum is σ = 71609142. Its totient is φ = 71609140.

The previous prime is 71609137. The next prime is 71609173. The reversal of 71609141 is 14190617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62331025 + 9278116 = 7895^2 + 3046^2 .

It is a cyclic number.

It is not a de Polignac number, because 71609141 - 2² = 71609137 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71609441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35804570 + 35804571.

It is an arithmetic number, because the mean of its divisors is an integer number (35804571).

Almost surely, 2^71609141 is an apocalyptic number.

It is an amenable number.

71609141 is a deficient number, since it is larger than the sum of its proper divisors (1).

71609141 is an equidigital number, since it uses as much as digits as its factorization.

71609141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 71609141 is about 8462.2184443561. The cubic root of 71609141 is about 415.2626024612.

Adding to 71609141 its reverse (14190617), we get a palindrome (85799758).

The spelling of 71609141 in words is "seventy-one million, six hundred nine thousand, one hundred forty-one".