53978191 has 2 divisors, whose sum is σ = 53978192. Its totient is φ = 53978190.

The previous prime is 53978189. The next prime is 53978203. The reversal of 53978191 is 19187935.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53978191 - 2¹ = 53978189 is a prime.

Together with 53978189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53978131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26989095 + 26989096.

It is an arithmetic number, because the mean of its divisors is an integer number (26989096).

Almost surely, 2^53978191 is an apocalyptic number.

53978191 is a deficient number, since it is larger than the sum of its proper divisors (1).

53978191 is an equidigital number, since it uses as much as digits as its factorization.

53978191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 53978191 is about 7346.9851639975. The cubic root of 53978191 is about 377.9254236386.

The spelling of 53978191 in words is "fifty-three million, nine hundred seventy-eight thousand, one hundred ninety-one".