71829661 has 2 divisors, whose sum is σ = 71829662. Its totient is φ = 71829660.

The previous prime is 71829649. The next prime is 71829679. The reversal of 71829661 is 16692817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61136761 + 10692900 = 7819^2 + 3270^2 .

It is an emirp because it is prime and its reverse (16692817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71829661 - 2⁵ = 71829629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71827661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35914830 + 35914831.

It is an arithmetic number, because the mean of its divisors is an integer number (35914831).

Almost surely, 2^71829661 is an apocalyptic number.

It is an amenable number.

71829661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71829661 is an equidigital number, since it uses as much as digits as its factorization.

71829661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 71829661 is about 8475.2381087495. The cubic root of 71829661 is about 415.6884320319.

The spelling of 71829661 in words is "seventy-one million, eight hundred twenty-nine thousand, six hundred sixty-one".