71630549 has 6 divisors (see below), whose sum is σ = 72305730. Its totient is φ = 70961616.

The previous prime is 71630527. The next prime is 71630563. The reversal of 71630549 is 94503617.

It can be written as a sum of positive squares in 3 ways, for example, as 41049649 + 30580900 = 6407^2 + 5530^2 .

It is not a de Polignac number, because 71630549 - 2¹² = 71626453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71630509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8867 + ... + 14895.

It is an arithmetic number, because the mean of its divisors is an integer number (12050955).

Almost surely, 2^71630549 is an apocalyptic number.

It is an amenable number.

71630549 is a deficient number, since it is larger than the sum of its proper divisors (675181).

71630549 is an equidigital number, since it uses as much as digits as its factorization.

71630549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6247 (or 6138 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 71630549 is about 8463.4832663626. The cubic root of 71630549 is about 415.3039801210.

The spelling of 71630549 in words is "seventy-one million, six hundred thirty thousand, five hundred forty-nine".