51129389 has 2 divisors, whose sum is σ = 51129390. Its totient is φ = 51129388.

The previous prime is 51129383. The next prime is 51129401. The reversal of 51129389 is 98392115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 6889 = 7150^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 51129389 - 2¹⁶ = 51063853 is a prime.

It is a super-2 number, since 2×51129389² = 5228428839026642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51129383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25564694 + 25564695.

It is an arithmetic number, because the mean of its divisors is an integer number (25564695).

Almost surely, 2^51129389 is an apocalyptic number.

It is an amenable number.

51129389 is a deficient number, since it is larger than the sum of its proper divisors (1).

51129389 is an equidigital number, since it uses as much as digits as its factorization.

51129389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 51129389 is about 7150.4817320234. The cubic root of 51129389 is about 371.1563264742.

The spelling of 51129389 in words is "fifty-one million, one hundred twenty-nine thousand, three hundred eighty-nine".