51000049 has 2 divisors, whose sum is σ = 51000050. Its totient is φ = 51000048.

The previous prime is 51000041. The next prime is 51000071. The reversal of 51000049 is 94000015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50979600 + 20449 = 7140^2 + 143^2 .

It is a cyclic number.

It is not a de Polignac number, because 51000049 - 2³ = 51000041 is a prime.

It is not a weakly prime, because it can be changed into another prime (51000041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25500024 + 25500025.

It is an arithmetic number, because the mean of its divisors is an integer number (25500025).

Almost surely, 2^51000049 is an apocalyptic number.

It is an amenable number.

51000049 is a deficient number, since it is larger than the sum of its proper divisors (1).

51000049 is an equidigital number, since it uses as much as digits as its factorization.

51000049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 51000049 is about 7141.4318592282. The cubic root of 51000049 is about 370.8430956933.

The spelling of 51000049 in words is "fifty-one million, forty-nine", and thus it is an aban number and an uban number.