51047779 has 2 divisors, whose sum is σ = 51047780. Its totient is φ = 51047778.

The previous prime is 51047671. The next prime is 51047807. The reversal of 51047779 is 97774015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51047779 - 2⁹ = 51047267 is a prime.

It is not a weakly prime, because it can be changed into another prime (51042779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25523889 + 25523890.

It is an arithmetic number, because the mean of its divisors is an integer number (25523890).

Almost surely, 2^51047779 is an apocalyptic number.

51047779 is a deficient number, since it is larger than the sum of its proper divisors (1).

51047779 is an equidigital number, since it uses as much as digits as its factorization.

51047779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61740, while the sum is 40.

The square root of 51047779 is about 7144.7728445347. The cubic root of 51047779 is about 370.9587480137.

The spelling of 51047779 in words is "fifty-one million, forty-seven thousand, seven hundred seventy-nine".