378335861 has 2 divisors, whose sum is σ = 378335862. Its totient is φ = 378335860.

The previous prime is 378335851. The next prime is 378335863. The reversal of 378335861 is 168533873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320195236 + 58140625 = 17894^2 + 7625^2 .

It is an emirp because it is prime and its reverse (168533873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378335861 is a prime.

It is a super-2 number, since 2×378335861² = 286276047437222642, which contains 22 as substring.

Together with 378335863, it forms a pair of twin primes.

It is a Chen 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 (378335863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189167930 + 189167931.

It is an arithmetic number, because the mean of its divisors is an integer number (189167931).

Almost surely, 2^378335861 is an apocalyptic number.

It is an amenable number.

378335861 is a deficient number, since it is larger than the sum of its proper divisors (1).

378335861 is an equidigital number, since it uses as much as digits as its factorization.

378335861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 378335861 is about 19450.8575903480. The cubic root of 378335861 is about 723.2567621004.

The spelling of 378335861 in words is "three hundred seventy-eight million, three hundred thirty-five thousand, eight hundred sixty-one".