825215261 has 8 divisors (see below), whose sum is σ = 890467200. Its totient is φ = 760216752.

The previous prime is 825215249. The next prime is 825215263. The reversal of 825215261 is 162512528.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 825215261 - 2⁶ = 825215197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825215263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56561 + ... + 69638.

It is an arithmetic number, because the mean of its divisors is an integer number (111308400).

Almost surely, 2^825215261 is an apocalyptic number.

It is an amenable number.

825215261 is a deficient number, since it is larger than the sum of its proper divisors (65251939).

825215261 is a wasteful number, since it uses less digits than its factorization.

825215261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126715.

The product of its digits is 9600, while the sum is 32.

The square root of 825215261 is about 28726.5602013189. The cubic root of 825215261 is about 937.9702926567.

Adding to 825215261 its reverse (162512528), we get a palindrome (987727789).

The spelling of 825215261 in words is "eight hundred twenty-five million, two hundred fifteen thousand, two hundred sixty-one".