51212649 has 16 divisors (see below), whose sum is σ = 71144640. Its totient is φ = 32739840.

The previous prime is 51212633. The next prime is 51212659. The reversal of 51212649 is 94621215.

51212649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51212649 - 2⁴ = 51212633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51212659) 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 in 15 ways as a sum of consecutive naturals, for example, 3729 + ... + 10785.

It is an arithmetic number, because the mean of its divisors is an integer number (4446540).

Almost surely, 2^51212649 is an apocalyptic number.

51212649 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

51212649 is a deficient number, since it is larger than the sum of its proper divisors (19931991).

51212649 is a wasteful number, since it uses less digits than its factorization.

51212649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7160.

The product of its digits is 4320, while the sum is 30.

The square root of 51212649 is about 7156.3013491608. The cubic root of 51212649 is about 371.3576830551.

The spelling of 51212649 in words is "fifty-one million, two hundred twelve thousand, six hundred forty-nine".