378491161 has 2 divisors, whose sum is σ = 378491162. Its totient is φ = 378491160.

The previous prime is 378491159. The next prime is 378491171. The reversal of 378491161 is 161194873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373455625 + 5035536 = 19325^2 + 2244^2 .

It is a cyclic number.

It is not a de Polignac number, because 378491161 - 2¹ = 378491159 is a prime.

Together with 378491159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (378491171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189245580 + 189245581.

It is an arithmetic number, because the mean of its divisors is an integer number (189245581).

Almost surely, 2^378491161 is an apocalyptic number.

It is an amenable number.

378491161 is a deficient number, since it is larger than the sum of its proper divisors (1).

378491161 is an equidigital number, since it uses as much as digits as its factorization.

378491161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 378491161 is about 19454.8492926571. The cubic root of 378491161 is about 723.3557098181.

Subtracting from 378491161 its product of digits (36288), we obtain a palindrome (378454873).

The spelling of 378491161 in words is "three hundred seventy-eight million, four hundred ninety-one thousand, one hundred sixty-one".