51123817 has 2 divisors, whose sum is σ = 51123818. Its totient is φ = 51123816.

The previous prime is 51123803. The next prime is 51123833. The reversal of 51123817 is 71832115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45643536 + 5480281 = 6756^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 51123817 - 2¹⁵ = 51091049 is a prime.

It is a super-2 number, since 2×51123817² = 5227289329298978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51123887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25561908 + 25561909.

It is an arithmetic number, because the mean of its divisors is an integer number (25561909).

Almost surely, 2^51123817 is an apocalyptic number.

It is an amenable number.

51123817 is a deficient number, since it is larger than the sum of its proper divisors (1).

51123817 is an equidigital number, since it uses as much as digits as its factorization.

51123817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 51123817 is about 7150.0920973090. The cubic root of 51123817 is about 371.1428433078.

The spelling of 51123817 in words is "fifty-one million, one hundred twenty-three thousand, eight hundred seventeen".