51748931 has 4 divisors (see below), whose sum is σ = 55729632. Its totient is φ = 47768232.

The previous prime is 51748891. The next prime is 51748937. The reversal of 51748931 is 13984715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13984715 = 5 ⋅2796943.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51748931 is a prime.

It is a super-2 number, since 2×51748931² = 5355903719285522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51748937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1990331 + ... + 1990356.

It is an arithmetic number, because the mean of its divisors is an integer number (13932408).

Almost surely, 2^51748931 is an apocalyptic number.

51748931 is a deficient number, since it is larger than the sum of its proper divisors (3980701).

51748931 is a wasteful number, since it uses less digits than its factorization.

51748931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980700.

The product of its digits is 30240, while the sum is 38.

The square root of 51748931 is about 7193.6729839492. The cubic root of 51748931 is about 372.6494297103.

The spelling of 51748931 in words is "fifty-one million, seven hundred forty-eight thousand, nine hundred thirty-one".