51286649 has 4 divisors (see below), whose sum is σ = 51377040. Its totient is φ = 51196260.

The previous prime is 51286607. The next prime is 51286657. The reversal of 51286649 is 94668215.

It is a happy number.

51286649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94668215 = 5 ⋅18933643.

It is a cyclic number.

It is not a de Polignac number, because 51286649 - 2⁸ = 51286393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51288649) 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 3 ways as a sum of consecutive naturals, for example, 44339 + ... + 45480.

It is an arithmetic number, because the mean of its divisors is an integer number (12844260).

Almost surely, 2^51286649 is an apocalyptic number.

It is an amenable number.

51286649 is a deficient number, since it is larger than the sum of its proper divisors (90391).

51286649 is an equidigital number, since it uses as much as digits as its factorization.

51286649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90390.

The product of its digits is 103680, while the sum is 41.

The square root of 51286649 is about 7161.4697513848. The cubic root of 51286649 is about 371.5364620852.

The spelling of 51286649 in words is "fifty-one million, two hundred eighty-six thousand, six hundred forty-nine".