71231649 has 16 divisors (see below), whose sum is σ = 102705408. Its totient is φ = 43741952.

The previous prime is 71231639. The next prime is 71231663. The reversal of 71231649 is 94613217.

It is not a de Polignac number, because 71231649 - 2⁵ = 71231617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71231639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12462 + ... + 17255.

It is an arithmetic number, because the mean of its divisors is an integer number (6419088).

Almost surely, 2^71231649 is an apocalyptic number.

It is an amenable number.

71231649 is a deficient number, since it is larger than the sum of its proper divisors (31473759).

71231649 is a wasteful number, since it uses less digits than its factorization.

71231649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29784.

The product of its digits is 9072, while the sum is 33.

The square root of 71231649 is about 8439.8844186399. The cubic root of 71231649 is about 414.5316223499.

The spelling of 71231649 in words is "seventy-one million, two hundred thirty-one thousand, six hundred forty-nine".