8531491256 has 16 divisors (see below), whose sum is σ = 15997821840. Its totient is φ = 4265405440.

The previous prime is 8531491253. The next prime is 8531491349. The reversal of 8531491256 is 6521941358.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8531491253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87416 + ... + 157176.

It is an arithmetic number, because the mean of its divisors is an integer number (999863865).

Almost surely, 2^8531491256 is an apocalyptic number.

It is an amenable number.

8531491256 is a deficient number, since it is larger than the sum of its proper divisors (7466330584).

8531491256 is a wasteful number, since it uses less digits than its factorization.

8531491256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85054 (or 85050 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The square root of 8531491256 is about 92366.0719961610. The cubic root of 8531491256 is about 2043.3447673389.

The spelling of 8531491256 in words is "eight billion, five hundred thirty-one million, four hundred ninety-one thousand, two hundred fifty-six".