378825521 has 4 divisors (see below), whose sum is σ = 391888500. Its totient is φ = 365762544.

The previous prime is 378825443. The next prime is 378825533. The reversal of 378825521 is 125528873.

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

It can be written as a sum of positive squares in 2 ways, for example, as 248409121 + 130416400 = 15761^2 + 11420^2 .

It is a cyclic number.

It is not a de Polignac number, because 378825521 - 2¹⁰ = 378824497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378825121) 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, 6531446 + ... + 6531503.

It is an arithmetic number, because the mean of its divisors is an integer number (97972125).

Almost surely, 2^378825521 is an apocalyptic number.

It is an amenable number.

378825521 is a deficient number, since it is larger than the sum of its proper divisors (13062979).

378825521 is a wasteful number, since it uses less digits than its factorization.

378825521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13062978.

The product of its digits is 134400, while the sum is 41.

The square root of 378825521 is about 19463.4406259531. The cubic root of 378825521 is about 723.5686518493.

The spelling of 378825521 in words is "three hundred seventy-eight million, eight hundred twenty-five thousand, five hundred twenty-one".