51520379 has 2 divisors, whose sum is σ = 51520380. Its totient is φ = 51520378.

The previous prime is 51520373. The next prime is 51520411. The reversal of 51520379 is 97302515.

51520379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (51520411) can be obtained adding 51520379 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520379 is a prime.

It is not a weakly prime, because it can be changed into another prime (51520373) 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, 25760189 + 25760190.

It is an arithmetic number, because the mean of its divisors is an integer number (25760190).

Almost surely, 2^51520379 is an apocalyptic number.

51520379 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520379 is an equidigital number, since it uses as much as digits as its factorization.

51520379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 51520379 is about 7177.7697789773. The cubic root of 51520379 is about 372.1000111682.

The spelling of 51520379 in words is "fifty-one million, five hundred twenty thousand, three hundred seventy-nine".