51380249 has 2 divisors, whose sum is σ = 51380250. Its totient is φ = 51380248.

The previous prime is 51380233. The next prime is 51380269. The reversal of 51380249 is 94208315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51380224 + 25 = 7168^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 51380249 - 2⁴ = 51380233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51380269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25690124 + 25690125.

It is an arithmetic number, because the mean of its divisors is an integer number (25690125).

Almost surely, 2^51380249 is an apocalyptic number.

It is an amenable number.

51380249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51380249 is an equidigital number, since it uses as much as digits as its factorization.

51380249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 51380249 is about 7168.0017438614. The cubic root of 51380249 is about 371.7623472440.

The spelling of 51380249 in words is "fifty-one million, three hundred eighty thousand, two hundred forty-nine".