550000091 has 2 divisors, whose sum is σ = 550000092. Its totient is φ = 550000090.

The previous prime is 550000021. The next prime is 550000097. The reversal of 550000091 is 190000055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 550000091 - 2²² = 545805787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (550000097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275000045 + 275000046.

It is an arithmetic number, because the mean of its divisors is an integer number (275000046).

Almost surely, 2^550000091 is an apocalyptic number.

550000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

550000091 is an equidigital number, since it uses as much as digits as its factorization.

550000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 550000091 is about 23452.0807392436. The cubic root of 550000091 is about 819.3213157875.

The spelling of 550000091 in words is "five hundred fifty million, ninety-one", and thus it is an aban number.