51140249 has 2 divisors, whose sum is σ = 51140250. Its totient is φ = 51140248.

The previous prime is 51140237. The next prime is 51140251. The reversal of 51140249 is 94204115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45225625 + 5914624 = 6725^2 + 2432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51140249 is a prime.

It is a Sophie Germain prime.

Together with 51140251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51140279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25570124 + 25570125.

It is an arithmetic number, because the mean of its divisors is an integer number (25570125).

Almost surely, 2^51140249 is an apocalyptic number.

It is an amenable number.

51140249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51140249 is an equidigital number, since it uses as much as digits as its factorization.

51140249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51140249 is about 7151.2410810991. The cubic root of 51140249 is about 371.1826027668.

The spelling of 51140249 in words is "fifty-one million, one hundred forty thousand, two hundred forty-nine".