378332261 has 2 divisors, whose sum is σ = 378332262. Its totient is φ = 378332260.

The previous prime is 378332257. The next prime is 378332299. The reversal of 378332261 is 162233873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271623361 + 106708900 = 16481^2 + 10330^2 .

It is a cyclic number.

It is not a de Polignac number, because 378332261 - 2² = 378332257 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378332861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189166130 + 189166131.

It is an arithmetic number, because the mean of its divisors is an integer number (189166131).

Almost surely, 2^378332261 is an apocalyptic number.

It is an amenable number.

378332261 is a deficient number, since it is larger than the sum of its proper divisors (1).

378332261 is an equidigital number, since it uses as much as digits as its factorization.

378332261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 35.

The square root of 378332261 is about 19450.7650492211. The cubic root of 378332261 is about 723.2544680782.

The spelling of 378332261 in words is "three hundred seventy-eight million, three hundred thirty-two thousand, two hundred sixty-one".