51940110809 has 2 divisors, whose sum is σ = 51940110810. Its totient is φ = 51940110808.

The previous prime is 51940110763. The next prime is 51940110821. The reversal of 51940110809 is 90801104915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32010577225 + 19929533584 = 178915^2 + 141172^2 .

It is a cyclic number.

It is not a de Polignac number, because 51940110809 - 2¹⁶ = 51940045273 is a prime.

It is a super-2 number, since 2×51940110809² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51940110869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25970055404 + 25970055405.

It is an arithmetic number, because the mean of its divisors is an integer number (25970055405).

Almost surely, 2^51940110809 is an apocalyptic number.

It is an amenable number.

51940110809 is a deficient number, since it is larger than the sum of its proper divisors (1).

51940110809 is an equidigital number, since it uses as much as digits as its factorization.

51940110809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 38.

The spelling of 51940110809 in words is "fifty-one billion, nine hundred forty million, one hundred ten thousand, eight hundred nine".