378655591 has 2 divisors, whose sum is σ = 378655592. Its totient is φ = 378655590.

The previous prime is 378655531. The next prime is 378655597. The reversal of 378655591 is 195556873.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 378655591 - 2²⁷ = 244437863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378655597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189327795 + 189327796.

It is an arithmetic number, because the mean of its divisors is an integer number (189327796).

Almost surely, 2^378655591 is an apocalyptic number.

378655591 is a deficient number, since it is larger than the sum of its proper divisors (1).

378655591 is an equidigital number, since it uses as much as digits as its factorization.

378655591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 49.

The square root of 378655591 is about 19459.0747724551. The cubic root of 378655591 is about 723.4604451212.

The spelling of 378655591 in words is "three hundred seventy-eight million, six hundred fifty-five thousand, five hundred ninety-one".