51873653 has 4 divisors (see below), whose sum is σ = 55863948. Its totient is φ = 47883360.

The previous prime is 51873649. The next prime is 51873683. The reversal of 51873653 is 35637815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21325924 + 30547729 = 4618^2 + 5527^2 .

It is a cyclic number.

It is not a de Polignac number, because 51873653 - 2² = 51873649 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 (51873623) 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, 1995128 + ... + 1995153.

It is an arithmetic number, because the mean of its divisors is an integer number (13965987).

Almost surely, 2^51873653 is an apocalyptic number.

It is an amenable number.

51873653 is a deficient number, since it is larger than the sum of its proper divisors (3990295).

51873653 is a wasteful number, since it uses less digits than its factorization.

51873653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990294.

The product of its digits is 75600, while the sum is 38.

The square root of 51873653 is about 7202.3366347318. The cubic root of 51873653 is about 372.9485682116.

The spelling of 51873653 in words is "fifty-one million, eight hundred seventy-three thousand, six hundred fifty-three".