51122431 has 4 divisors (see below), whose sum is σ = 51140664. Its totient is φ = 51104200.

The previous prime is 51122413. The next prime is 51122437. The reversal of 51122431 is 13422115.

51122431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51122431 - 2⁹ = 51121919 is a prime.

It is a super-2 number, since 2×51122431² = 5227005902699522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51122399 and 51122408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51122437) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3925 + ... + 10846.

It is an arithmetic number, because the mean of its divisors is an integer number (12785166).

Almost surely, 2^51122431 is an apocalyptic number.

51122431 is a deficient number, since it is larger than the sum of its proper divisors (18233).

51122431 is a wasteful number, since it uses less digits than its factorization.

51122431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18232.

The product of its digits is 240, while the sum is 19.

The square root of 51122431 is about 7149.9951748235. The cubic root of 51122431 is about 371.1394893027.

Adding to 51122431 its reverse (13422115), we get a palindrome (64544546).

The spelling of 51122431 in words is "fifty-one million, one hundred twenty-two thousand, four hundred thirty-one".