51390331 has 2 divisors, whose sum is σ = 51390332. Its totient is φ = 51390330.

The previous prime is 51390301. The next prime is 51390347. The reversal of 51390331 is 13309315.

51390331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51390331 - 2¹¹ = 51388283 is a prime.

It is a super-2 number, since 2×51390331² = 5281932240579122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51390296 and 51390305.

It is not a weakly prime, because it can be changed into another prime (51390301) 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, 25695165 + 25695166.

It is an arithmetic number, because the mean of its divisors is an integer number (25695166).

Almost surely, 2^51390331 is an apocalyptic number.

51390331 is a deficient number, since it is larger than the sum of its proper divisors (1).

51390331 is an equidigital number, since it uses as much as digits as its factorization.

51390331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215, while the sum is 25.

The square root of 51390331 is about 7168.7049737034. The cubic root of 51390331 is about 371.7866617937.

Adding to 51390331 its reverse (13309315), we get a palindrome (64699646).

The spelling of 51390331 in words is "fifty-one million, three hundred ninety thousand, three hundred thirty-one".