51142789 has 2 divisors, whose sum is σ = 51142790. Its totient is φ = 51142788.

The previous prime is 51142771. The next prime is 51142829. The reversal of 51142789 is 98724115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45454564 + 5688225 = 6742^2 + 2385^2 .

It is a cyclic number.

It is not a de Polignac number, because 51142789 - 2⁹ = 51142277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51142709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25571394 + 25571395.

It is an arithmetic number, because the mean of its divisors is an integer number (25571395).

Almost surely, 2^51142789 is an apocalyptic number.

It is an amenable number.

51142789 is a deficient number, since it is larger than the sum of its proper divisors (1).

51142789 is an equidigital number, since it uses as much as digits as its factorization.

51142789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 51142789 is about 7151.4186704457. The cubic root of 51142789 is about 371.1887478823.

The spelling of 51142789 in words is "fifty-one million, one hundred forty-two thousand, seven hundred eighty-nine".