51223331 has 2 divisors, whose sum is σ = 51223332. Its totient is φ = 51223330.

The previous prime is 51223321. The next prime is 51223343. The reversal of 51223331 is 13332215.

51223331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51223331 - 2²² = 47029027 is a prime.

It is a super-2 number, since 2×51223331² = 5247659277471122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51223301) 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 as a sum of consecutive naturals, namely, 25611665 + 25611666.

It is an arithmetic number, because the mean of its divisors is an integer number (25611666).

Almost surely, 2^51223331 is an apocalyptic number.

51223331 is a deficient number, since it is larger than the sum of its proper divisors (1).

51223331 is an equidigital number, since it uses as much as digits as its factorization.

51223331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 20.

The square root of 51223331 is about 7157.0476455030. The cubic root of 51223331 is about 371.3835006808.

Adding to 51223331 its reverse (13332215), we get a palindrome (64555546).

The spelling of 51223331 in words is "fifty-one million, two hundred twenty-three thousand, three hundred thirty-one".