51181787 has 2 divisors, whose sum is σ = 51181788. Its totient is φ = 51181786.

The previous prime is 51181777. The next prime is 51181789. The reversal of 51181787 is 78718115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51181787 - 2⁴ = 51181771 is a prime.

Together with 51181789, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51181787.

It is not a weakly prime, because it can be changed into another prime (51181789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25590893 + 25590894.

It is an arithmetic number, because the mean of its divisors is an integer number (25590894).

Almost surely, 2^51181787 is an apocalyptic number.

51181787 is a deficient number, since it is larger than the sum of its proper divisors (1).

51181787 is an equidigital number, since it uses as much as digits as its factorization.

51181787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 38.

The square root of 51181787 is about 7154.1447427348. The cubic root of 51181787 is about 371.2830716456.

The spelling of 51181787 in words is "fifty-one million, one hundred eighty-one thousand, seven hundred eighty-seven".