378589261 has 2 divisors, whose sum is σ = 378589262. Its totient is φ = 378589260.

The previous prime is 378589259. The next prime is 378589331. The reversal of 378589261 is 162985873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225300100 + 153289161 = 15010^2 + 12381^2 .

It is a cyclic number.

It is not a de Polignac number, because 378589261 - 2¹ = 378589259 is a prime.

It is a super-2 number, since 2×378589261² = 286659657089052242, which contains 22 as substring.

Together with 378589259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378599261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189294630 + 189294631.

It is an arithmetic number, because the mean of its divisors is an integer number (189294631).

Almost surely, 2^378589261 is an apocalyptic number.

It is an amenable number.

378589261 is a deficient number, since it is larger than the sum of its proper divisors (1).

378589261 is an equidigital number, since it uses as much as digits as its factorization.

378589261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 378589261 is about 19457.3703516174. The cubic root of 378589261 is about 723.4181992257.

The spelling of 378589261 in words is "three hundred seventy-eight million, five hundred eighty-nine thousand, two hundred sixty-one".