52978391 has 2 divisors, whose sum is σ = 52978392. Its totient is φ = 52978390.

The previous prime is 52978381. The next prime is 52978397. The reversal of 52978391 is 19387925.

52978391 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 52978391 - 2¹⁰ = 52977367 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52978397) 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, 26489195 + 26489196.

It is an arithmetic number, because the mean of its divisors is an integer number (26489196).

Almost surely, 2^52978391 is an apocalyptic number.

52978391 is a deficient number, since it is larger than the sum of its proper divisors (1).

52978391 is an equidigital number, since it uses as much as digits as its factorization.

52978391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 52978391 is about 7278.6256257621. The cubic root of 52978391 is about 375.5775184329.

The spelling of 52978391 in words is "fifty-two million, nine hundred seventy-eight thousand, three hundred ninety-one".