51213044 has 12 divisors (see below), whose sum is σ = 94894884. Its totient is φ = 24100224.

The previous prime is 51213031. The next prime is 51213047. The reversal of 51213044 is 44031215.

It can be written as a sum of positive squares in 2 ways, for example, as 47059600 + 4153444 = 6860^2 + 2038^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213047) 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, 376499 + ... + 376634.

It is an arithmetic number, because the mean of its divisors is an integer number (7907907).

Almost surely, 2^51213044 is an apocalyptic number.

It is an amenable number.

51213044 is a deficient number, since it is larger than the sum of its proper divisors (43681840).

51213044 is a wasteful number, since it uses less digits than its factorization.

51213044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753154 (or 753152 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 51213044 is about 7156.3289471628. The cubic root of 51213044 is about 371.3586378056.

Adding to 51213044 its reverse (44031215), we get a palindrome (95244259).

The spelling of 51213044 in words is "fifty-one million, two hundred thirteen thousand, forty-four".