53749991 has 2 divisors, whose sum is σ = 53749992. Its totient is φ = 53749990.

The previous prime is 53749981. The next prime is 53750009. The reversal of 53749991 is 19994735.

53749991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53749991 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 (53749981) 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, 26874995 + 26874996.

It is an arithmetic number, because the mean of its divisors is an integer number (26874996).

Almost surely, 2^53749991 is an apocalyptic number.

53749991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53749991 is an equidigital number, since it uses as much as digits as its factorization.

53749991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 53749991 is about 7331.4385355127. The cubic root of 53749991 is about 377.3920946506.

The spelling of 53749991 in words is "fifty-three million, seven hundred forty-nine thousand, nine hundred ninety-one".