8531521457 has 8 divisors (see below), whose sum is σ = 8817918696. Its totient is φ = 8248061952.

The previous prime is 8531521403. The next prime is 8531521463. The reversal of 8531521457 is 7541251358.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4613262241 + 3918259216 = 67921^2 + 62596^2 .

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 8531521457 - 2⁶ = 8531521393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8531521487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728528 + ... + 740145.

It is an arithmetic number, because the mean of its divisors is an integer number (1102239837).

Almost surely, 2^8531521457 is an apocalyptic number.

It is an amenable number.

8531521457 is a deficient number, since it is larger than the sum of its proper divisors (286397239).

8531521457 is a wasteful number, since it uses less digits than its factorization.

8531521457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468867.

The product of its digits is 168000, while the sum is 41.

The square root of 8531521457 is about 92366.2354813706. The cubic root of 8531521457 is about 2043.3471784447.

The spelling of 8531521457 in words is "eight billion, five hundred thirty-one million, five hundred twenty-one thousand, four hundred fifty-seven".