51503189 has 2 divisors, whose sum is σ = 51503190. Its totient is φ = 51503188.

The previous prime is 51503173. The next prime is 51503203. The reversal of 51503189 is 98130515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 380689 = 7150^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 51503189 - 2⁴ = 51503173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51503119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25751594 + 25751595.

It is an arithmetic number, because the mean of its divisors is an integer number (25751595).

Almost surely, 2^51503189 is an apocalyptic number.

It is an amenable number.

51503189 is a deficient number, since it is larger than the sum of its proper divisors (1).

51503189 is an equidigital number, since it uses as much as digits as its factorization.

51503189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 51503189 is about 7176.5722319224. The cubic root of 51503189 is about 372.0586222988.

The spelling of 51503189 in words is "fifty-one million, five hundred three thousand, one hundred eighty-nine".