825218087 has 4 divisors (see below), whose sum is σ = 825460800. Its totient is φ = 824975376.

The previous prime is 825218059. The next prime is 825218123. The reversal of 825218087 is 780812528.

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

It is a cyclic number.

It is not a de Polignac number, because 825218087 - 2¹⁴ = 825201703 is a prime.

It is a super-2 number, since 2×825218087² = 1361969782223879138, 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 (825218687) 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, 116183 + ... + 123080.

It is an arithmetic number, because the mean of its divisors is an integer number (206365200).

Almost surely, 2^825218087 is an apocalyptic number.

825218087 is a deficient number, since it is larger than the sum of its proper divisors (242713).

825218087 is a wasteful number, since it uses less digits than its factorization.

825218087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242712.

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 825218087 is about 28726.6093892057. The cubic root of 825218087 is about 937.9713633676.

The spelling of 825218087 in words is "eight hundred twenty-five million, two hundred eighteen thousand, eighty-seven".