51238749 has 8 divisors (see below), whose sum is σ = 68363680. Its totient is φ = 34136496.

The previous prime is 51238739. The next prime is 51238751. The reversal of 51238749 is 94783215.

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

It is not a de Polignac number, because 51238749 - 2⁵ = 51238717 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 (51238729) 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, 594 + ... + 10140.

It is an arithmetic number, because the mean of its divisors is an integer number (8545460).

Almost surely, 2^51238749 is an apocalyptic number.

It is an amenable number.

51238749 is a deficient number, since it is larger than the sum of its proper divisors (17124931).

51238749 is a wasteful number, since it uses less digits than its factorization.

51238749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11339.

The product of its digits is 60480, while the sum is 39.

The square root of 51238749 is about 7158.1246845805. The cubic root of 51238749 is about 371.4207585494.

The spelling of 51238749 in words is "fifty-one million, two hundred thirty-eight thousand, seven hundred forty-nine".