51486779 has 2 divisors, whose sum is σ = 51486780. Its totient is φ = 51486778.

The previous prime is 51486739. The next prime is 51486791. The reversal of 51486779 is 97768415.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51486779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51486739) 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, 25743389 + 25743390.

It is an arithmetic number, because the mean of its divisors is an integer number (25743390).

Almost surely, 2^51486779 is an apocalyptic number.

51486779 is a deficient number, since it is larger than the sum of its proper divisors (1).

51486779 is an equidigital number, since it uses as much as digits as its factorization.

51486779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The square root of 51486779 is about 7175.4288373588. The cubic root of 51486779 is about 372.0191028653.

The spelling of 51486779 in words is "fifty-one million, four hundred eighty-six thousand, seven hundred seventy-nine".