51420979 has 2 divisors, whose sum is σ = 51420980. Its totient is φ = 51420978.

The previous prime is 51420923. The next prime is 51420983. The reversal of 51420979 is 97902415.

51420979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51420979 - 2⁷ = 51420851 is a prime.

It is not a weakly prime, because it can be changed into another prime (51420079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25710489 + 25710490.

It is an arithmetic number, because the mean of its divisors is an integer number (25710490).

Almost surely, 2^51420979 is an apocalyptic number.

51420979 is a deficient number, since it is larger than the sum of its proper divisors (1).

51420979 is an equidigital number, since it uses as much as digits as its factorization.

51420979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 51420979 is about 7170.8422796768. The cubic root of 51420979 is about 371.8605554166.

The spelling of 51420979 in words is "fifty-one million, four hundred twenty thousand, nine hundred seventy-nine".