551604191 has 2 divisors, whose sum is σ = 551604192. Its totient is φ = 551604190.

The previous prime is 551604187. The next prime is 551604203. The reversal of 551604191 is 191406155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551604191 - 2² = 551604187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551604121) 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, 275802095 + 275802096.

It is an arithmetic number, because the mean of its divisors is an integer number (275802096).

Almost surely, 2^551604191 is an apocalyptic number.

551604191 is a deficient number, since it is larger than the sum of its proper divisors (1).

551604191 is an equidigital number, since it uses as much as digits as its factorization.

551604191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 551604191 is about 23486.2553635100. The cubic root of 551604191 is about 820.1170718234.

The spelling of 551604191 in words is "five hundred fifty-one million, six hundred four thousand, one hundred ninety-one".