378599261 has 2 divisors, whose sum is σ = 378599262. Its totient is φ = 378599260.

The previous prime is 378599257. The next prime is 378599269. The reversal of 378599261 is 162995873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359292025 + 19307236 = 18955^2 + 4394^2 .

It is an emirp because it is prime and its reverse (162995873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378599261 - 2² = 378599257 is a prime.

It is a super-2 number, since 2×378599261² = 286674800859492242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378599269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189299630 + 189299631.

It is an arithmetic number, because the mean of its divisors is an integer number (189299631).

Almost surely, 2^378599261 is an apocalyptic number.

It is an amenable number.

378599261 is a deficient number, since it is larger than the sum of its proper divisors (1).

378599261 is an equidigital number, since it uses as much as digits as its factorization.

378599261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 378599261 is about 19457.6273219527. The cubic root of 378599261 is about 723.4245685896.

The spelling of 378599261 in words is "three hundred seventy-eight million, five hundred ninety-nine thousand, two hundred sixty-one".