51188321 has 2 divisors, whose sum is σ = 51188322. Its totient is φ = 51188320.

The previous prime is 51188281. The next prime is 51188327. The reversal of 51188321 is 12388115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49900096 + 1288225 = 7064^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 51188321 - 2¹⁸ = 50926177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51188327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25594160 + 25594161.

It is an arithmetic number, because the mean of its divisors is an integer number (25594161).

Almost surely, 2^51188321 is an apocalyptic number.

It is an amenable number.

51188321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51188321 is an equidigital number, since it uses as much as digits as its factorization.

51188321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 29.

The square root of 51188321 is about 7154.6013865204. The cubic root of 51188321 is about 371.2988706274.

The spelling of 51188321 in words is "fifty-one million, one hundred eighty-eight thousand, three hundred twenty-one".