379378661 has 2 divisors, whose sum is σ = 379378662. Its totient is φ = 379378660.

The previous prime is 379378607. The next prime is 379378663. The reversal of 379378661 is 166873973.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258598561 + 120780100 = 16081^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 379378661 - 2²² = 375184357 is a prime.

It is a Sophie Germain prime.

Together with 379378663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (379378663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189689330 + 189689331.

It is an arithmetic number, because the mean of its divisors is an integer number (189689331).

Almost surely, 2^379378661 is an apocalyptic number.

It is an amenable number.

379378661 is a deficient number, since it is larger than the sum of its proper divisors (1).

379378661 is an equidigital number, since it uses as much as digits as its factorization.

379378661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 379378661 is about 19477.6451605424. The cubic root of 379378661 is about 723.9206521763.

The spelling of 379378661 in words is "three hundred seventy-nine million, three hundred seventy-eight thousand, six hundred sixty-one".