825816279 has 4 divisors (see below), whose sum is σ = 1101088376. Its totient is φ = 550544184.

The previous prime is 825816253. The next prime is 825816287. The reversal of 825816279 is 972618528.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 825816279 - 2¹⁶ = 825750743 is a prime.

It is a super-2 number, since 2×825816279² = 1363945053322811682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825816379) 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, 137636044 + ... + 137636049.

It is an arithmetic number, because the mean of its divisors is an integer number (275272094).

Almost surely, 2^825816279 is an apocalyptic number.

825816279 is a deficient number, since it is larger than the sum of its proper divisors (275272097).

825816279 is a wasteful number, since it uses less digits than its factorization.

825816279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275272096.

The product of its digits is 483840, while the sum is 48.

The square root of 825816279 is about 28737.0193130742. The cubic root of 825816279 is about 938.1979505182.

The spelling of 825816279 in words is "eight hundred twenty-five million, eight hundred sixteen thousand, two hundred seventy-nine".