378691601 has 4 divisors (see below), whose sum is σ = 378742500. Its totient is φ = 378640704.

The previous prime is 378691517. The next prime is 378691667. The reversal of 378691601 is 106196873.

It is a Cunningham number, because it is equal to 19460²+1.

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 314707600 + 63984001 = 17740^2 + 7999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378691601 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 (378691681) 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, 11876 + ... + 29973.

It is an arithmetic number, because the mean of its divisors is an integer number (94685625).

Almost surely, 2^378691601 is an apocalyptic number.

It is an amenable number.

378691601 is a deficient number, since it is larger than the sum of its proper divisors (50899).

378691601 is an equidigital number, since it uses as much as digits as its factorization.

378691601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50898.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 378691601 is about 19460.0000256937. Note that the first 4 decimals coincide. The cubic root of 378691601 is about 723.4833779970.

The spelling of 378691601 in words is "three hundred seventy-eight million, six hundred ninety-one thousand, six hundred one".