51909976309 has 2 divisors, whose sum is σ = 51909976310. Its totient is φ = 51909976308.

The previous prime is 51909976271. The next prime is 51909976331. The reversal of 51909976309 is 90367990915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26214848100 + 25695128209 = 161910^2 + 160297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51909976309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51909976409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25954988154 + 25954988155.

It is an arithmetic number, because the mean of its divisors is an integer number (25954988155).

Almost surely, 2^51909976309 is an apocalyptic number.

It is an amenable number.

51909976309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51909976309 is an equidigital number, since it uses as much as digits as its factorization.

51909976309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4133430, while the sum is 58.

The spelling of 51909976309 in words is "fifty-one billion, nine hundred nine million, nine hundred seventy-six thousand, three hundred nine".