51304909 has 2 divisors, whose sum is σ = 51304910. Its totient is φ = 51304908.

The previous prime is 51304889. The next prime is 51304933. The reversal of 51304909 is 90940315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27510025 + 23794884 = 5245^2 + 4878^2 .

It is a cyclic number.

It is not a de Polignac number, because 51304909 - 2⁹ = 51304397 is a prime.

It is a super-3 number, since 3×51304909³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51304109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25652454 + 25652455.

It is an arithmetic number, because the mean of its divisors is an integer number (25652455).

Almost surely, 2^51304909 is an apocalyptic number.

It is an amenable number.

51304909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51304909 is an equidigital number, since it uses as much as digits as its factorization.

51304909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 51304909 is about 7162.7445158961. The cubic root of 51304909 is about 371.5805505626.

The spelling of 51304909 in words is "fifty-one million, three hundred four thousand, nine hundred nine".