825510381 has 4 divisors (see below), whose sum is σ = 1100680512. Its totient is φ = 550340252.

The previous prime is 825510373. The next prime is 825510383. The reversal of 825510381 is 183015528.

It is a happy number.

825510381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 825510381 - 2³ = 825510373 is a prime.

It is a super-2 number, since 2×825510381² = 1362934778277530322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825510383) 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, 137585061 + ... + 137585066.

It is an arithmetic number, because the mean of its divisors is an integer number (275170128).

Almost surely, 2^825510381 is an apocalyptic number.

It is an amenable number.

825510381 is a deficient number, since it is larger than the sum of its proper divisors (275170131).

825510381 is a wasteful number, since it uses less digits than its factorization.

825510381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275170130.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 825510381 is about 28731.6964518282. The cubic root of 825510381 is about 938.0820941116.

The spelling of 825510381 in words is "eight hundred twenty-five million, five hundred ten thousand, three hundred eighty-one".