71696561 has 2 divisors, whose sum is σ = 71696562. Its totient is φ = 71696560.

The previous prime is 71696551. The next prime is 71696587. The reversal of 71696561 is 16569617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38056561 + 33640000 = 6169^2 + 5800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71696561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71696551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35848280 + 35848281.

It is an arithmetic number, because the mean of its divisors is an integer number (35848281).

Almost surely, 2^71696561 is an apocalyptic number.

It is an amenable number.

71696561 is a deficient number, since it is larger than the sum of its proper divisors (1).

71696561 is an equidigital number, since it uses as much as digits as its factorization.

71696561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 71696561 is about 8467.3821810522. The cubic root of 71696561 is about 415.4315170890.

The spelling of 71696561 in words is "seventy-one million, six hundred ninety-six thousand, five hundred sixty-one".