51085249 has 2 divisors, whose sum is σ = 51085250. Its totient is φ = 51085248.

The previous prime is 51085213. The next prime is 51085253. The reversal of 51085249 is 94258015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43467649 + 7617600 = 6593^2 + 2760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51085249 is a prime.

It is not a weakly prime, because it can be changed into another prime (51085649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25542624 + 25542625.

It is an arithmetic number, because the mean of its divisors is an integer number (25542625).

Almost surely, 2^51085249 is an apocalyptic number.

It is an amenable number.

51085249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51085249 is an equidigital number, since it uses as much as digits as its factorization.

51085249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 51085249 is about 7147.3945602576. The cubic root of 51085249 is about 371.0494893090.

It can be divided in two parts, 5 and 1085249, that multiplied together give a palindrome (5426245).

The spelling of 51085249 in words is "fifty-one million, eighty-five thousand, two hundred forty-nine".