55550291 has 2 divisors, whose sum is σ = 55550292. Its totient is φ = 55550290.

The previous prime is 55550279. The next prime is 55550309. The reversal of 55550291 is 19205555.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55550291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55550191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775145 + 27775146.

It is an arithmetic number, because the mean of its divisors is an integer number (27775146).

Almost surely, 2^55550291 is an apocalyptic number.

55550291 is a deficient number, since it is larger than the sum of its proper divisors (1).

55550291 is an equidigital number, since it uses as much as digits as its factorization.

55550291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 55550291 is about 7453.2067595096. The cubic root of 55550291 is about 381.5593609803.

The spelling of 55550291 in words is "fifty-five million, five hundred fifty thousand, two hundred ninety-one".