825512281 has 4 divisors (see below), whose sum is σ = 900558864. Its totient is φ = 750465700.

The previous prime is 825512279. The next prime is 825512309. The reversal of 825512281 is 182215528.

It is a happy number.

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 825512281 - 2¹ = 825512279 is a prime.

It is a super-2 number, since 2×825512281² = 1362941052163645922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (825512201) 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 3 ways as a sum of consecutive naturals, for example, 37523275 + ... + 37523296.

It is an arithmetic number, because the mean of its divisors is an integer number (225139716).

Almost surely, 2^825512281 is an apocalyptic number.

It is an amenable number.

825512281 is a deficient number, since it is larger than the sum of its proper divisors (75046583).

825512281 is a wasteful number, since it uses less digits than its factorization.

825512281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75046582.

The product of its digits is 12800, while the sum is 34.

The square root of 825512281 is about 28731.7295163379. The cubic root of 825512281 is about 938.0828138097.

The spelling of 825512281 in words is "eight hundred twenty-five million, five hundred twelve thousand, two hundred eighty-one".