51909511 has 2 divisors, whose sum is σ = 51909512. Its totient is φ = 51909510.

The previous prime is 51909509. The next prime is 51909521. The reversal of 51909511 is 11590915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51909511 - 2¹ = 51909509 is a prime.

Together with 51909509, 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 (51909521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25954755 + 25954756.

It is an arithmetic number, because the mean of its divisors is an integer number (25954756).

Almost surely, 2^51909511 is an apocalyptic number.

51909511 is a deficient number, since it is larger than the sum of its proper divisors (1).

51909511 is an equidigital number, since it uses as much as digits as its factorization.

51909511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 51909511 is about 7204.8255357087. The cubic root of 51909511 is about 373.0344827927.

The spelling of 51909511 in words is "fifty-one million, nine hundred nine thousand, five hundred eleven".