551078191 has 2 divisors, whose sum is σ = 551078192. Its totient is φ = 551078190.

The previous prime is 551078173. The next prime is 551078219. The reversal of 551078191 is 191870155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551078191 - 2⁷ = 551078063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551078191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551078291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275539095 + 275539096.

It is an arithmetic number, because the mean of its divisors is an integer number (275539096).

Almost surely, 2^551078191 is an apocalyptic number.

551078191 is a deficient number, since it is larger than the sum of its proper divisors (1).

551078191 is an equidigital number, since it uses as much as digits as its factorization.

551078191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 37.

The square root of 551078191 is about 23475.0546538235. The cubic root of 551078191 is about 819.8563058739.

It can be divided in two parts, 55 and 1078191, that added together give a triangular number (1078246 = T₁₄₆₈).

The spelling of 551078191 in words is "five hundred fifty-one million, seventy-eight thousand, one hundred ninety-one".