51243911 has 2 divisors, whose sum is σ = 51243912. Its totient is φ = 51243910.

The previous prime is 51243889. The next prime is 51243937. The reversal of 51243911 is 11934215.

It is an a-pointer prime, because the next prime (51243937) can be obtained adding 51243911 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51243911 - 2⁶ = 51243847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51240911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25621955 + 25621956.

It is an arithmetic number, because the mean of its divisors is an integer number (25621956).

Almost surely, 2^51243911 is an apocalyptic number.

51243911 is a deficient number, since it is larger than the sum of its proper divisors (1).

51243911 is an equidigital number, since it uses as much as digits as its factorization.

51243911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 51243911 is about 7158.4852447987. The cubic root of 51243911 is about 371.4332309432.

The spelling of 51243911 in words is "fifty-one million, two hundred forty-three thousand, nine hundred eleven".