51019889 has 2 divisors, whose sum is σ = 51019890. Its totient is φ = 51019888.

The previous prime is 51019879. The next prime is 51019931. The reversal of 51019889 is 98891015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49350625 + 1669264 = 7025^2 + 1292^2 .

It is a cyclic number.

It is not a de Polignac number, because 51019889 - 2²⁴ = 34242673 is a prime.

It is not a weakly prime, because it can be changed into another prime (51019849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25509944 + 25509945.

It is an arithmetic number, because the mean of its divisors is an integer number (25509945).

Almost surely, 2^51019889 is an apocalyptic number.

It is an amenable number.

51019889 is a deficient number, since it is larger than the sum of its proper divisors (1).

51019889 is an equidigital number, since it uses as much as digits as its factorization.

51019889 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 41.

The square root of 51019889 is about 7142.8208013361. The cubic root of 51019889 is about 370.8911778246.

The spelling of 51019889 in words is "fifty-one million, nineteen thousand, eight hundred eighty-nine".