51898009 has 2 divisors, whose sum is σ = 51898010. Its totient is φ = 51898008.

The previous prime is 51898001. The next prime is 51898019. The reversal of 51898009 is 90089815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36905625 + 14992384 = 6075^2 + 3872^2 .

It is a cyclic number.

It is not a de Polignac number, because 51898009 - 2³ = 51898001 is a prime.

It is not a weakly prime, because it can be changed into another prime (51898001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25949004 + 25949005.

It is an arithmetic number, because the mean of its divisors is an integer number (25949005).

Almost surely, 2^51898009 is an apocalyptic number.

It is an amenable number.

51898009 is a deficient number, since it is larger than the sum of its proper divisors (1).

51898009 is an equidigital number, since it uses as much as digits as its factorization.

51898009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 51898009 is about 7204.0272764614. The cubic root of 51898009 is about 373.0069286927.

The spelling of 51898009 in words is "fifty-one million, eight hundred ninety-eight thousand, nine".