825083639 has 4 divisors (see below), whose sum is σ = 828994200. Its totient is φ = 821173080.

The previous prime is 825083603. The next prime is 825083641. The reversal of 825083639 is 936380528.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825083639 is a prime.

It is a super-2 number, since 2×825083639² = 1361526022690964642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 825083639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825083659) 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, 1954964 + ... + 1955385.

It is an arithmetic number, because the mean of its divisors is an integer number (207248550).

Almost surely, 2^825083639 is an apocalyptic number.

825083639 is a deficient number, since it is larger than the sum of its proper divisors (3910561).

825083639 is a wasteful number, since it uses less digits than its factorization.

825083639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910560.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 825083639 is about 28724.2691638969. The cubic root of 825083639 is about 937.9204211883.

The spelling of 825083639 in words is "eight hundred twenty-five million, eighty-three thousand, six hundred thirty-nine".