51334542491 has 2 divisors, whose sum is σ = 51334542492. Its totient is φ = 51334542490.

The previous prime is 51334542461. The next prime is 51334542529. The reversal of 51334542491 is 19424543315.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51334542491 is a prime.

It is not a weakly prime, because it can be changed into another prime (51334542401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25667271245 + 25667271246.

It is an arithmetic number, because the mean of its divisors is an integer number (25667271246).

Almost surely, 2^51334542491 is an apocalyptic number.

51334542491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51334542491 is an equidigital number, since it uses as much as digits as its factorization.

51334542491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The spelling of 51334542491 in words is "fifty-one billion, three hundred thirty-four million, five hundred forty-two thousand, four hundred ninety-one".