71317649 has 8 divisors (see below), whose sum is σ = 77026152. Its totient is φ = 65640960.

The previous prime is 71317643. The next prime is 71317651. The reversal of 71317649 is 94671317.

It can be written as a sum of positive squares in 4 ways, for example, as 6225025 + 65092624 = 2495^2 + 8068^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71317649 - 2¹² = 71313553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71317643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3182 + ... + 12359.

It is an arithmetic number, because the mean of its divisors is an integer number (9628269).

Almost surely, 2^71317649 is an apocalyptic number.

It is an amenable number.

71317649 is a deficient number, since it is larger than the sum of its proper divisors (5708503).

71317649 is a wasteful number, since it uses less digits than its factorization.

71317649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15907.

The product of its digits is 31752, while the sum is 38.

The square root of 71317649 is about 8444.9777382773. The cubic root of 71317649 is about 414.6983805379.

The spelling of 71317649 in words is "seventy-one million, three hundred seventeen thousand, six hundred forty-nine".