825408251 has 4 divisors (see below), whose sum is σ = 827746872. Its totient is φ = 823069632.

The previous prime is 825408193. The next prime is 825408257. The reversal of 825408251 is 152804528.

It is a happy number.

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 825408251 - 2¹⁴ = 825391867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (825408257) 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, 1168781 + ... + 1169486.

It is an arithmetic number, because the mean of its divisors is an integer number (206936718).

Almost surely, 2^825408251 is an apocalyptic number.

825408251 is a deficient number, since it is larger than the sum of its proper divisors (2338621).

825408251 is a wasteful number, since it uses less digits than its factorization.

825408251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338620.

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 825408251 is about 28729.9190914280. The cubic root of 825408251 is about 938.0434068228.

The spelling of 825408251 in words is "eight hundred twenty-five million, four hundred eight thousand, two hundred fifty-one".