51340031 has 2 divisors, whose sum is σ = 51340032. Its totient is φ = 51340030.

The previous prime is 51340021. The next prime is 51340049. The reversal of 51340031 is 13004315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51340031 - 2²² = 47145727 is a prime.

It is a super-2 number, since 2×51340031² = 5271597566161922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51339991 and 51340009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51340021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25670015 + 25670016.

It is an arithmetic number, because the mean of its divisors is an integer number (25670016).

Almost surely, 2^51340031 is an apocalyptic number.

51340031 is a deficient number, since it is larger than the sum of its proper divisors (1).

51340031 is an equidigital number, since it uses as much as digits as its factorization.

51340031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 51340031 is about 7165.1958103041. The cubic root of 51340031 is about 371.6653226662.

Adding to 51340031 its reverse (13004315), we get a palindrome (64344346).

The spelling of 51340031 in words is "fifty-one million, three hundred forty thousand, thirty-one".