55813691 has 2 divisors, whose sum is σ = 55813692. Its totient is φ = 55813690.

The previous prime is 55813679. The next prime is 55813741. The reversal of 55813691 is 19631855.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55813691 - 2¹⁴ = 55797307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55813631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27906845 + 27906846.

It is an arithmetic number, because the mean of its divisors is an integer number (27906846).

Almost surely, 2^55813691 is an apocalyptic number.

55813691 is a deficient number, since it is larger than the sum of its proper divisors (1).

55813691 is an equidigital number, since it uses as much as digits as its factorization.

55813691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 55813691 is about 7470.8561089075. The cubic root of 55813691 is about 382.1614838580.

The spelling of 55813691 in words is "fifty-five million, eight hundred thirteen thousand, six hundred ninety-one".