5561100091 has 2 divisors, whose sum is σ = 5561100092. Its totient is φ = 5561100090.

The previous prime is 5561100079. The next prime is 5561100107. The reversal of 5561100091 is 1900011655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5561100091 - 2¹⁷ = 5560969019 is a prime.

It is not a weakly prime, because it can be changed into another prime (5561100071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780550045 + 2780550046.

It is an arithmetic number, because the mean of its divisors is an integer number (2780550046).

Almost surely, 2^5561100091 is an apocalyptic number.

5561100091 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561100091 is an equidigital number, since it uses as much as digits as its factorization.

5561100091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 5561100091 is about 74572.7838490692. The cubic root of 5561100091 is about 1771.6866142145.

The spelling of 5561100091 in words is "five billion, five hundred sixty-one million, one hundred thousand, ninety-one".