51531222 has 16 divisors (see below), whose sum is σ = 103306752. Its totient is φ = 17136360.

The previous prime is 51531217. The next prime is 51531251. The reversal of 51531222 is 22213515.

51531222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7378 + ... + 12549.

It is an arithmetic number, because the mean of its divisors is an integer number (6456672).

Almost surely, 2^51531222 is an apocalyptic number.

51531222 is an abundant number, since it is smaller than the sum of its proper divisors (51775530).

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

51531222 is a wasteful number, since it uses less digits than its factorization.

51531222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20363.

The product of its digits is 600, while the sum is 21.

The square root of 51531222 is about 7178.5250574195. The cubic root of 51531222 is about 372.1261134439.

Adding to 51531222 its reverse (22213515), we get a palindrome (73744737).

The spelling of 51531222 in words is "fifty-one million, five hundred thirty-one thousand, two hundred twenty-two".