51939473 has 4 divisors (see below), whose sum is σ = 51955008. Its totient is φ = 51923940.

The previous prime is 51939467. The next prime is 51939509. The reversal of 51939473 is 37493915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37493915 = 5 ⋅7498783.

It is a cyclic number.

It is not a de Polignac number, because 51939473 - 2⁴ = 51939457 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 51939473.

It is not an unprimeable number, because it can be changed into a prime (51939073) 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, 461 + ... + 10202.

It is an arithmetic number, because the mean of its divisors is an integer number (12988752).

Almost surely, 2^51939473 is an apocalyptic number.

It is an amenable number.

51939473 is a deficient number, since it is larger than the sum of its proper divisors (15535).

51939473 is a wasteful number, since it uses less digits than its factorization.

51939473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15534.

The product of its digits is 102060, while the sum is 41.

The square root of 51939473 is about 7206.9045366232. The cubic root of 51939473 is about 373.1062404163.

The spelling of 51939473 in words is "fifty-one million, nine hundred thirty-nine thousand, four hundred seventy-three".