51936649 has 4 divisors (see below), whose sum is σ = 54991764. Its totient is φ = 48881536.

The previous prime is 51936629. The next prime is 51936659. The reversal of 51936649 is 94663915.

51936649 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 an emirpimes, since its reverse is a distinct semiprime: 94663915 = 5 ⋅18932783.

It can be written as a sum of positive squares in 2 ways, for example, as 45968400 + 5968249 = 6780^2 + 2443^2 .

It is a cyclic number.

It is not a de Polignac number, because 51936649 - 2¹⁷ = 51805577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51936629) 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, 1527532 + ... + 1527565.

It is an arithmetic number, because the mean of its divisors is an integer number (13747941).

Almost surely, 2^51936649 is an apocalyptic number.

It is an amenable number.

51936649 is a deficient number, since it is larger than the sum of its proper divisors (3055115).

51936649 is a wasteful number, since it uses less digits than its factorization.

51936649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3055114.

The product of its digits is 174960, while the sum is 43.

The square root of 51936649 is about 7206.7086107321. The cubic root of 51936649 is about 373.0994782432.

The spelling of 51936649 in words is "fifty-one million, nine hundred thirty-six thousand, six hundred forty-nine".