825252509 has 4 divisors (see below), whose sum is σ = 827167680. Its totient is φ = 823337340.

The previous prime is 825252499. The next prime is 825252521. The reversal of 825252509 is 905252528.

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 a de Polignac number, because none of the positive numbers 2^k-825252509 is a prime.

It is a super-2 number, since 2×825252509² = 1362083407221590162, 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 (825252409) 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, 956939 + ... + 957800.

It is an arithmetic number, because the mean of its divisors is an integer number (206791920).

Almost surely, 2^825252509 is an apocalyptic number.

It is an amenable number.

825252509 is a deficient number, since it is larger than the sum of its proper divisors (1915171).

825252509 is a wasteful number, since it uses less digits than its factorization.

825252509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915170.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 825252509 is about 28727.2085138811. The cubic root of 825252509 is about 937.9844049307.

The spelling of 825252509 in words is "eight hundred twenty-five million, two hundred fifty-two thousand, five hundred nine".