51213289 has 2 divisors, whose sum is σ = 51213290. Its totient is φ = 51213288.

The previous prime is 51213277. The next prime is 51213319. The reversal of 51213289 is 98231215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50197225 + 1016064 = 7085^2 + 1008^2 .

It is a cyclic number.

It is not a de Polignac number, because 51213289 - 2⁵ = 51213257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51213289.

It is not a weakly prime, because it can be changed into another prime (51213689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606644 + 25606645.

It is an arithmetic number, because the mean of its divisors is an integer number (25606645).

Almost surely, 2^51213289 is an apocalyptic number.

It is an amenable number.

51213289 is a deficient number, since it is larger than the sum of its proper divisors (1).

51213289 is an equidigital number, since it uses as much as digits as its factorization.

51213289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 51213289 is about 7156.3460648574. The cubic root of 51213289 is about 371.3592299902.

The spelling of 51213289 in words is "fifty-one million, two hundred thirteen thousand, two hundred eighty-nine".