828531609 has 4 divisors (see below), whose sum is σ = 1104708816. Its totient is φ = 552354404.

The previous prime is 828531607. The next prime is 828531643. The reversal of 828531609 is 906135828.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 828531609 - 2¹ = 828531607 is a prime.

It is a super-2 number, since 2×828531609² = 1372929254224257762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (828531607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138088599 + ... + 138088604.

It is an arithmetic number, because the mean of its divisors is an integer number (276177204).

Almost surely, 2^828531609 is an apocalyptic number.

It is an amenable number.

828531609 is a deficient number, since it is larger than the sum of its proper divisors (276177207).

828531609 is a wasteful number, since it uses less digits than its factorization.

828531609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276177206.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 828531609 is about 28784.2250025947. The cubic root of 828531609 is about 939.2251079578.

The spelling of 828531609 in words is "eight hundred twenty-eight million, five hundred thirty-one thousand, six hundred nine".