398180551 has 2 divisors, whose sum is σ = 398180552. Its totient is φ = 398180550.

The previous prime is 398180539. The next prime is 398180609. The reversal of 398180551 is 155081893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398180551 - 2⁹ = 398180039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398180501) 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, 199090275 + 199090276.

It is an arithmetic number, because the mean of its divisors is an integer number (199090276).

Almost surely, 2^398180551 is an apocalyptic number.

398180551 is a deficient number, since it is larger than the sum of its proper divisors (1).

398180551 is an equidigital number, since it uses as much as digits as its factorization.

398180551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 398180551 is about 19954.4619321093. The cubic root of 398180551 is about 735.6874503639.

The spelling of 398180551 in words is "three hundred ninety-eight million, one hundred eighty thousand, five hundred fifty-one".