51644051 has 16 divisors (see below), whose sum is σ = 54468288. Its totient is φ = 48921600.

The previous prime is 51644009. The next prime is 51644053. The reversal of 51644051 is 15044615.

It is a cyclic number.

It is not a de Polignac number, because 51644051 - 2⁶ = 51643987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51644051.

It is not an unprimeable number, because it can be changed into a prime (51644053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328865 + ... + 329021.

It is an arithmetic number, because the mean of its divisors is an integer number (3404268).

Almost surely, 2^51644051 is an apocalyptic number.

51644051 is a deficient number, since it is larger than the sum of its proper divisors (2824237).

51644051 is a wasteful number, since it uses less digits than its factorization.

51644051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51644051 is about 7186.3795474495. The cubic root of 51644051 is about 372.3975088506.

Adding to 51644051 its reverse (15044615), we get a palindrome (66688666).

The spelling of 51644051 in words is "fifty-one million, six hundred forty-four thousand, fifty-one".