51269819 has 2 divisors, whose sum is σ = 51269820. Its totient is φ = 51269818.

The previous prime is 51269791. The next prime is 51269821. The reversal of 51269819 is 91896215.

It is a happy number.

51269819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51269819 is a prime.

It is a super-2 number, since 2×51269819² = 5257188680585522, which contains 22 as substring.

Together with 51269821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51269839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25634909 + 25634910.

It is an arithmetic number, because the mean of its divisors is an integer number (25634910).

Almost surely, 2^51269819 is an apocalyptic number.

51269819 is a deficient number, since it is larger than the sum of its proper divisors (1).

51269819 is an equidigital number, since it uses as much as digits as its factorization.

51269819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 41.

The square root of 51269819 is about 7160.2946168436. The cubic root of 51269819 is about 371.4958170513.

The spelling of 51269819 in words is "fifty-one million, two hundred sixty-nine thousand, eight hundred nineteen".