55719691 has 2 divisors, whose sum is σ = 55719692. Its totient is φ = 55719690.

The previous prime is 55719661. The next prime is 55719707. The reversal of 55719691 is 19691755.

55719691 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 55719691 - 2¹⁵ = 55686923 is a prime.

It is not a weakly prime, because it can be changed into another prime (55719611) 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, 27859845 + 27859846.

It is an arithmetic number, because the mean of its divisors is an integer number (27859846).

Almost surely, 2^55719691 is an apocalyptic number.

55719691 is a deficient number, since it is larger than the sum of its proper divisors (1).

55719691 is an equidigital number, since it uses as much as digits as its factorization.

55719691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 85050, while the sum is 43.

The square root of 55719691 is about 7464.5623448398. The cubic root of 55719691 is about 381.9468210833.

The spelling of 55719691 in words is "fifty-five million, seven hundred nineteen thousand, six hundred ninety-one".