51809000293 has 2 divisors, whose sum is σ = 51809000294. Its totient is φ = 51809000292.

The previous prime is 51809000251. The next prime is 51809000317. The reversal of 51809000293 is 39200090815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28724148324 + 23084851969 = 169482^2 + 151937^2 .

It is a cyclic number.

It is not a de Polignac number, because 51809000293 - 2¹⁷ = 51808869221 is a prime.

It is a super-2 number, since 2×51809000293² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51809000693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25904500146 + 25904500147.

It is an arithmetic number, because the mean of its divisors is an integer number (25904500147).

Almost surely, 2^51809000293 is an apocalyptic number.

It is an amenable number.

51809000293 is a deficient number, since it is larger than the sum of its proper divisors (1).

51809000293 is an equidigital number, since it uses as much as digits as its factorization.

51809000293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 51809000293 in words is "fifty-one billion, eight hundred nine million, two hundred ninety-three", and thus it is an aban number.