827139521 has 16 divisors (see below), whose sum is σ = 942560640. Its totient is φ = 719539200.

The previous prime is 827139503. The next prime is 827139581. The reversal of 827139521 is 125931728.

It is a cyclic number.

It is not a de Polignac number, because 827139521 - 2⁶ = 827139457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (827139581) 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, 38996 + ... + 56346.

It is an arithmetic number, because the mean of its divisors is an integer number (58910040).

Almost surely, 2^827139521 is an apocalyptic number.

It is an amenable number.

827139521 is a deficient number, since it is larger than the sum of its proper divisors (115421119).

827139521 is a wasteful number, since it uses less digits than its factorization.

827139521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17576.

The product of its digits is 30240, while the sum is 38.

The square root of 827139521 is about 28760.0333970599. The cubic root of 827139521 is about 938.6987884851.

The spelling of 827139521 in words is "eight hundred twenty-seven million, one hundred thirty-nine thousand, five hundred twenty-one".