51492491 has 2 divisors, whose sum is σ = 51492492. Its totient is φ = 51492490.

The previous prime is 51492443. The next prime is 51492499. The reversal of 51492491 is 19429415.

51492491 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 not a de Polignac number, because 51492491 - 2¹⁰ = 51491467 is a prime.

It is not a weakly prime, because it can be changed into another prime (51492499) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25746245 + 25746246.

It is an arithmetic number, because the mean of its divisors is an integer number (25746246).

Almost surely, 2^51492491 is an apocalyptic number.

51492491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51492491 is an equidigital number, since it uses as much as digits as its factorization.

51492491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 51492491 is about 7175.8268513113. The cubic root of 51492491 is about 372.0328597597.

The spelling of 51492491 in words is "fifty-one million, four hundred ninety-two thousand, four hundred ninety-one".