51938645 has 18 divisors (see below), whose sum is σ = 68742114. Its totient is φ = 37644640.

The previous prime is 51938641. The next prime is 51938657. The reversal of 51938645 is 54683915.

It can be written as a sum of positive squares in 3 ways, for example, as 30492484 + 21446161 = 5522^2 + 4631^2 .

It is not a de Polignac number, because 51938645 - 2² = 51938641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51938641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 177119 + ... + 177411.

Almost surely, 2^51938645 is an apocalyptic number.

51938645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51938645 is a deficient number, since it is larger than the sum of its proper divisors (16803469).

51938645 is an equidigital number, since it uses as much as digits as its factorization.

51938645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 309 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 51938645 is about 7206.8470914818. The cubic root of 51938645 is about 373.1042577648.

The spelling of 51938645 in words is "fifty-one million, nine hundred thirty-eight thousand, six hundred forty-five".