51211040 has 48 divisors (see below), whose sum is σ = 122222520. Its totient is φ = 20275200.

The previous prime is 51211031. The next prime is 51211049. The reversal of 51211040 is 4011215.

It is an interprime number because it is at equal distance from previous prime (51211031) and next prime (51211049).

It can be written as a sum of positive squares in 4 ways, for example, as 51208336 + 2704 = 7156^2 + 52^2 .

It is not an unprimeable number, because it can be changed into a prime (51211049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14576 + ... + 17744.

Almost surely, 2^51211040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51211040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61111260).

51211040 is an abundant number, since it is smaller than the sum of its proper divisors (71011480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51211040 is a wasteful number, since it uses less digits than its factorization.

51211040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3285 (or 3277 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51211040 is about 7156.1889298704. The cubic root of 51211040 is about 371.3537939068.

Adding to 51211040 its reverse (4011215), we get a palindrome (55222255).

The spelling of 51211040 in words is "fifty-one million, two hundred eleven thousand, forty".