828178381 has 2 divisors, whose sum is σ = 828178382. Its totient is φ = 828178380.

The previous prime is 828178369. The next prime is 828178391. The reversal of 828178381 is 183871828.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 563302756 + 264875625 = 23734^2 + 16275^2 .

It is a cyclic number.

It is not a de Polignac number, because 828178381 - 2⁵ = 828178349 is a prime.

It is a super-2 number, since 2×828178381² = 1371758861511562322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (828178331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414089190 + 414089191.

It is an arithmetic number, because the mean of its divisors is an integer number (414089191).

Almost surely, 2^828178381 is an apocalyptic number.

It is an amenable number.

828178381 is a deficient number, since it is larger than the sum of its proper divisors (1).

828178381 is an equidigital number, since it uses as much as digits as its factorization.

828178381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 46.

The square root of 828178381 is about 28778.0885570950. The cubic root of 828178381 is about 939.0916156603.

The spelling of 828178381 in words is "eight hundred twenty-eight million, one hundred seventy-eight thousand, three hundred eighty-one".