551230391 has 2 divisors, whose sum is σ = 551230392. Its totient is φ = 551230390.

The previous prime is 551230367. The next prime is 551230409. The reversal of 551230391 is 193032155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551230391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551230301) 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, 275615195 + 275615196.

It is an arithmetic number, because the mean of its divisors is an integer number (275615196).

Almost surely, 2^551230391 is an apocalyptic number.

551230391 is a deficient number, since it is larger than the sum of its proper divisors (1).

551230391 is an equidigital number, since it uses as much as digits as its factorization.

551230391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 551230391 is about 23478.2961690153. The cubic root of 551230391 is about 819.9317764973.

The spelling of 551230391 in words is "five hundred fifty-one million, two hundred thirty thousand, three hundred ninety-one".