55691291 has 2 divisors, whose sum is σ = 55691292. Its totient is φ = 55691290.

The previous prime is 55691267. The next prime is 55691297. The reversal of 55691291 is 19219655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55691291 - 2¹⁰ = 55690267 is a prime.

It is not a weakly prime, because it can be changed into another prime (55691297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27845645 + 27845646.

It is an arithmetic number, because the mean of its divisors is an integer number (27845646).

Almost surely, 2^55691291 is an apocalyptic number.

55691291 is a deficient number, since it is larger than the sum of its proper divisors (1).

55691291 is an equidigital number, since it uses as much as digits as its factorization.

55691291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 38.

The square root of 55691291 is about 7462.6597805340. The cubic root of 55691291 is about 381.8819180363.

The spelling of 55691291 in words is "fifty-five million, six hundred ninety-one thousand, two hundred ninety-one".