51860909 has 2 divisors, whose sum is σ = 51860910. Its totient is φ = 51860908.

The previous prime is 51860869. The next prime is 51860911. The reversal of 51860909 is 90906815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44689225 + 7171684 = 6685^2 + 2678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51860909 is a prime.

Together with 51860911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51860959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25930454 + 25930455.

It is an arithmetic number, because the mean of its divisors is an integer number (25930455).

Almost surely, 2^51860909 is an apocalyptic number.

It is an amenable number.

51860909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51860909 is an equidigital number, since it uses as much as digits as its factorization.

51860909 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 38.

The square root of 51860909 is about 7201.4518675056. The cubic root of 51860909 is about 372.9180244734.

The spelling of 51860909 in words is "fifty-one million, eight hundred sixty thousand, nine hundred nine".