55011091 has 2 divisors, whose sum is σ = 55011092. Its totient is φ = 55011090.

The previous prime is 55011079. The next prime is 55011109. The reversal of 55011091 is 19011055.

Together with next prime (55011109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55011091 - 2¹⁷ = 54880019 is a prime.

It is not a weakly prime, because it can be changed into another prime (55011041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27505545 + 27505546.

It is an arithmetic number, because the mean of its divisors is an integer number (27505546).

Almost surely, 2^55011091 is an apocalyptic number.

55011091 is a deficient number, since it is larger than the sum of its proper divisors (1).

55011091 is an equidigital number, since it uses as much as digits as its factorization.

55011091 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 22.

The square root of 55011091 is about 7416.9462044699. The cubic root of 55011091 is about 380.3208071130.

The spelling of 55011091 in words is "fifty-five million, eleven thousand, ninety-one".