51812779 has 2 divisors, whose sum is σ = 51812780. Its totient is φ = 51812778.

The previous prime is 51812777. The next prime is 51812801. The reversal of 51812779 is 97721815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51812779 - 2¹ = 51812777 is a prime.

Together with 51812777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51812771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25906389 + 25906390.

It is an arithmetic number, because the mean of its divisors is an integer number (25906390).

Almost surely, 2^51812779 is an apocalyptic number.

51812779 is a deficient number, since it is larger than the sum of its proper divisors (1).

51812779 is an equidigital number, since it uses as much as digits as its factorization.

51812779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 40.

The square root of 51812779 is about 7198.1094045589. The cubic root of 51812779 is about 372.8026254174.

The spelling of 51812779 in words is "fifty-one million, eight hundred twelve thousand, seven hundred seventy-nine".