51563779 has 2 divisors, whose sum is σ = 51563780. Its totient is φ = 51563778.

The previous prime is 51563761. The next prime is 51563789. The reversal of 51563779 is 97736515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51563779 - 2¹³ = 51555587 is a prime.

It is not a weakly prime, because it can be changed into another prime (51563719) 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, 25781889 + 25781890.

It is an arithmetic number, because the mean of its divisors is an integer number (25781890).

Almost surely, 2^51563779 is an apocalyptic number.

51563779 is a deficient number, since it is larger than the sum of its proper divisors (1).

51563779 is an equidigital number, since it uses as much as digits as its factorization.

51563779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 198450, while the sum is 43.

The square root of 51563779 is about 7180.7923657491. The cubic root of 51563779 is about 372.2044656794.

The spelling of 51563779 in words is "fifty-one million, five hundred sixty-three thousand, seven hundred seventy-nine".