51986309 has 2 divisors, whose sum is σ = 51986310. Its totient is φ = 51986308.

The previous prime is 51986281. The next prime is 51986317. The reversal of 51986309 is 90368915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51984100 + 2209 = 7210^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 51986309 - 2¹⁶ = 51920773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51986329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25993154 + 25993155.

It is an arithmetic number, because the mean of its divisors is an integer number (25993155).

Almost surely, 2^51986309 is an apocalyptic number.

It is an amenable number.

51986309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51986309 is an equidigital number, since it uses as much as digits as its factorization.

51986309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 51986309 is about 7210.1531883865. The cubic root of 51986309 is about 373.2183552357.

The spelling of 51986309 in words is "fifty-one million, nine hundred eighty-six thousand, three hundred nine".