51911231 has 2 divisors, whose sum is σ = 51911232. Its totient is φ = 51911230.

The previous prime is 51911219. The next prime is 51911243. The reversal of 51911231 is 13211915.

51911231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (51911219) and next prime (51911243).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51911231 is a prime.

It is a super-2 number, since 2×51911231² = 5389551807870722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51911197 and 51911206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51911261) 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, 25955615 + 25955616.

It is an arithmetic number, because the mean of its divisors is an integer number (25955616).

Almost surely, 2^51911231 is an apocalyptic number.

51911231 is a deficient number, since it is larger than the sum of its proper divisors (1).

51911231 is an equidigital number, since it uses as much as digits as its factorization.

51911231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 23.

The square root of 51911231 is about 7204.9448991647. The cubic root of 51911231 is about 373.0386028612.

The spelling of 51911231 in words is "fifty-one million, nine hundred eleven thousand, two hundred thirty-one".