51644773 has 4 divisors (see below), whose sum is σ = 51719148. Its totient is φ = 51570400.

The previous prime is 51644771. The next prime is 51644777. The reversal of 51644773 is 37744615.

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 45603009 + 6041764 = 6753^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 51644773 - 2¹ = 51644771 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 (51644771) 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, 36136 + ... + 37537.

It is an arithmetic number, because the mean of its divisors is an integer number (12929787).

Almost surely, 2^51644773 is an apocalyptic number.

It is an amenable number.

51644773 is a deficient number, since it is larger than the sum of its proper divisors (74375).

51644773 is an equidigital number, since it uses as much as digits as its factorization.

51644773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74374.

The product of its digits is 70560, while the sum is 37.

The square root of 51644773 is about 7186.4297811918. The cubic root of 51644773 is about 372.3992442538.

The spelling of 51644773 in words is "fifty-one million, six hundred forty-four thousand, seven hundred seventy-three".