51703639 has 4 divisors (see below), whose sum is σ = 55680856. Its totient is φ = 47726424.

The previous prime is 51703633. The next prime is 51703643. The reversal of 51703639 is 93630715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93630715 = 5 ⋅18726143.

It is a cyclic number.

It is not a de Polignac number, because 51703639 - 2²⁵ = 18149207 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 (51703633) 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, 1988589 + ... + 1988614.

It is an arithmetic number, because the mean of its divisors is an integer number (13920214).

Almost surely, 2^51703639 is an apocalyptic number.

51703639 is a deficient number, since it is larger than the sum of its proper divisors (3977217).

51703639 is a wasteful number, since it uses less digits than its factorization.

51703639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977216.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 51703639 is about 7190.5242507066. The cubic root of 51703639 is about 372.5406805113.

The spelling of 51703639 in words is "fifty-one million, seven hundred three thousand, six hundred thirty-nine".