51731263 has 2 divisors, whose sum is σ = 51731264. Its totient is φ = 51731262.

The previous prime is 51731261. The next prime is 51731293. The reversal of 51731263 is 36213715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51731263 - 2¹ = 51731261 is a prime.

It is a super-2 number, since 2×51731263² = 5352247143150338, which contains 22 as substring.

Together with 51731261, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51731261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865631 + 25865632.

It is an arithmetic number, because the mean of its divisors is an integer number (25865632).

Almost surely, 2^51731263 is an apocalyptic number.

51731263 is a deficient number, since it is larger than the sum of its proper divisors (1).

51731263 is an equidigital number, since it uses as much as digits as its factorization.

51731263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 28.

The square root of 51731263 is about 7192.4448555411. Note that the first 3 decimals coincide. The cubic root of 51731263 is about 372.6070151816.

Adding to 51731263 its reverse (36213715), we get a palindrome (87944978).

The spelling of 51731263 in words is "fifty-one million, seven hundred thirty-one thousand, two hundred sixty-three".