51212549 has 2 divisors, whose sum is σ = 51212550. Its totient is φ = 51212548.

The previous prime is 51212537. The next prime is 51212561. The reversal of 51212549 is 94521215.

It is a balanced prime because it is at equal distance from previous prime (51212537) and next prime (51212561).

It can be written as a sum of positive squares in only one way, i.e., 44488900 + 6723649 = 6670^2 + 2593^2 .

It is a cyclic number.

It is not a de Polignac number, because 51212549 - 2⁴ = 51212533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51212509) 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, 25606274 + 25606275.

It is an arithmetic number, because the mean of its divisors is an integer number (25606275).

Almost surely, 2^51212549 is an apocalyptic number.

It is an amenable number.

51212549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51212549 is an equidigital number, since it uses as much as digits as its factorization.

51212549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 51212549 is about 7156.2943623079. The cubic root of 51212549 is about 371.3574413454.

The spelling of 51212549 in words is "fifty-one million, two hundred twelve thousand, five hundred forty-nine".