51051409 has 2 divisors, whose sum is σ = 51051410. Its totient is φ = 51051408.

The previous prime is 51051401. The next prime is 51051419. The reversal of 51051409 is 90415015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36966400 + 14085009 = 6080^2 + 3753^2 .

It is a cyclic number.

It is not a de Polignac number, because 51051409 - 2³ = 51051401 is a prime.

It is not a weakly prime, because it can be changed into another prime (51051401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25525704 + 25525705.

It is an arithmetic number, because the mean of its divisors is an integer number (25525705).

Almost surely, 2^51051409 is an apocalyptic number.

It is an amenable number.

51051409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51051409 is an equidigital number, since it uses as much as digits as its factorization.

51051409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51051409 is about 7145.0268718879. The cubic root of 51051409 is about 370.9675407458.

The spelling of 51051409 in words is "fifty-one million, fifty-one thousand, four hundred nine".