55691357 has 2 divisors, whose sum is σ = 55691358. Its totient is φ = 55691356.

The previous prime is 55691341. The next prime is 55691359. The reversal of 55691357 is 75319655.

55691357 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 can be written as a sum of positive squares in only one way, i.e., 46321636 + 9369721 = 6806^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 55691357 - 2⁴ = 55691341 is a prime.

Together with 55691359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55691359) 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, 27845678 + 27845679.

It is an arithmetic number, because the mean of its divisors is an integer number (27845679).

Almost surely, 2^55691357 is an apocalyptic number.

It is an amenable number.

55691357 is a deficient number, since it is larger than the sum of its proper divisors (1).

55691357 is an equidigital number, since it uses as much as digits as its factorization.

55691357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141750, while the sum is 41.

The square root of 55691357 is about 7462.6642025486. The cubic root of 55691357 is about 381.8820688929.

The spelling of 55691357 in words is "fifty-five million, six hundred ninety-one thousand, three hundred fifty-seven".