71821697 has 2 divisors, whose sum is σ = 71821698. Its totient is φ = 71821696.

The previous prime is 71821693. The next prime is 71821723. The reversal of 71821697 is 79612817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69872881 + 1948816 = 8359^2 + 1396^2 .

It is a cyclic number.

It is not a de Polignac number, because 71821697 - 2² = 71821693 is a prime.

It is not a weakly prime, because it can be changed into another prime (71821693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35910848 + 35910849.

It is an arithmetic number, because the mean of its divisors is an integer number (35910849).

Almost surely, 2^71821697 is an apocalyptic number.

It is an amenable number.

71821697 is a deficient number, since it is larger than the sum of its proper divisors (1).

71821697 is an equidigital number, since it uses as much as digits as its factorization.

71821697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 71821697 is about 8474.7682564186. The cubic root of 71821697 is about 415.6730685317.

The spelling of 71821697 in words is "seventy-one million, eight hundred twenty-one thousand, six hundred ninety-seven".