55157191 has 2 divisors, whose sum is σ = 55157192. Its totient is φ = 55157190.

The previous prime is 55157189. The next prime is 55157203. The reversal of 55157191 is 19175155.

It is a happy number.

55157191 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 not a de Polignac number, because 55157191 - 2¹ = 55157189 is a prime.

Together with 55157189, 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 (55157891) 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, 27578595 + 27578596.

It is an arithmetic number, because the mean of its divisors is an integer number (27578596).

Almost surely, 2^55157191 is an apocalyptic number.

55157191 is a deficient number, since it is larger than the sum of its proper divisors (1).

55157191 is an equidigital number, since it uses as much as digits as its factorization.

55157191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 34.

The square root of 55157191 is about 7426.7887407681. The cubic root of 55157191 is about 380.6571983820.

The spelling of 55157191 in words is "fifty-five million, one hundred fifty-seven thousand, one hundred ninety-one".