51232223209 has 2 divisors, whose sum is σ = 51232223210. Its totient is φ = 51232223208.

The previous prime is 51232223167. The next prime is 51232223267. The reversal of 51232223209 is 90232223215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49761117184 + 1471106025 = 223072^2 + 38355^2 .

It is a cyclic number.

It is not a de Polignac number, because 51232223209 - 2²³ = 51223834601 is a prime.

It is not a weakly prime, because it can be changed into another prime (51232223269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25616111604 + 25616111605.

It is an arithmetic number, because the mean of its divisors is an integer number (25616111605).

Almost surely, 2^51232223209 is an apocalyptic number.

It is an amenable number.

51232223209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51232223209 is an equidigital number, since it uses as much as digits as its factorization.

51232223209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 51232223209 in words is "fifty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, two hundred nine".