398294551 has 2 divisors, whose sum is σ = 398294552. Its totient is φ = 398294550.

The previous prime is 398294543. The next prime is 398294557. The reversal of 398294551 is 155492893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398294551 - 2³ = 398294543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398294557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199147275 + 199147276.

It is an arithmetic number, because the mean of its divisors is an integer number (199147276).

Almost surely, 2^398294551 is an apocalyptic number.

398294551 is a deficient number, since it is larger than the sum of its proper divisors (1).

398294551 is an equidigital number, since it uses as much as digits as its factorization.

398294551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 46.

The square root of 398294551 is about 19957.3182316663. The cubic root of 398294551 is about 735.7576533297.

The spelling of 398294551 in words is "three hundred ninety-eight million, two hundred ninety-four thousand, five hundred fifty-one".