51284491 has 2 divisors, whose sum is σ = 51284492. Its totient is φ = 51284490.

The previous prime is 51284483. The next prime is 51284573. The reversal of 51284491 is 19448215.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51284491 - 2³ = 51284483 is a prime.

It is not a weakly prime, because it can be changed into another prime (51281491) 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, 25642245 + 25642246.

It is an arithmetic number, because the mean of its divisors is an integer number (25642246).

Almost surely, 2^51284491 is an apocalyptic number.

51284491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51284491 is an equidigital number, since it uses as much as digits as its factorization.

51284491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 51284491 is about 7161.3190824037. The cubic root of 51284491 is about 371.5312509373.

The spelling of 51284491 in words is "fifty-one million, two hundred eighty-four thousand, four hundred ninety-one".