51338749 has 8 divisors (see below), whose sum is σ = 64006848. Its totient is φ = 40004160.

The previous prime is 51338743. The next prime is 51338753. The reversal of 51338749 is 94783315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51338749 - 2⁵ = 51338717 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 (51338743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333292 + ... + 333445.

It is an arithmetic number, because the mean of its divisors is an integer number (8000856).

Almost surely, 2^51338749 is an apocalyptic number.

It is an amenable number.

51338749 is a deficient number, since it is larger than the sum of its proper divisors (12668099).

51338749 is a wasteful number, since it uses less digits than its factorization.

51338749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666755.

The product of its digits is 90720, while the sum is 40.

The square root of 51338749 is about 7165.1063495248. The cubic root of 51338749 is about 371.6622290510.

The spelling of 51338749 in words is "fifty-one million, three hundred thirty-eight thousand, seven hundred forty-nine".