378521801 has 4 divisors (see below), whose sum is σ = 432596352. Its totient is φ = 324447252.

The previous prime is 378521789. The next prime is 378521831. The reversal of 378521801 is 108125873.

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 378521801 - 2²² = 374327497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (378521831) 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, 27037265 + ... + 27037278.

It is an arithmetic number, because the mean of its divisors is an integer number (108149088).

Almost surely, 2^378521801 is an apocalyptic number.

It is an amenable number.

378521801 is a deficient number, since it is larger than the sum of its proper divisors (54074551).

378521801 is an equidigital number, since it uses as much as digits as its factorization.

378521801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54074550.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 378521801 is about 19455.6367410578. The cubic root of 378521801 is about 723.3752285662.

The spelling of 378521801 in words is "three hundred seventy-eight million, five hundred twenty-one thousand, eight hundred one".