51241644 has 18 divisors (see below), whose sum is σ = 129527580. Its totient is φ = 17080536.

The previous prime is 51241607. The next prime is 51241657. The reversal of 51241644 is 44614215.

51241644 is a `hidden beast` number, since 5 + 12 + 4 + 1 + 644 = 666.

51241644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 711654 + ... + 711725.

Almost surely, 2^51241644 is an apocalyptic number.

It is an amenable number.

51241644 is an abundant number, since it is smaller than the sum of its proper divisors (78285936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51241644 is a wasteful number, since it uses less digits than its factorization.

51241644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423389 (or 1423384 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 51241644 is about 7158.3268994926. The cubic root of 51241644 is about 371.4277535344.

Adding to 51241644 its reverse (44614215), we get a palindrome (95855859).

The spelling of 51241644 in words is "fifty-one million, two hundred forty-one thousand, six hundred forty-four".