55131091 has 2 divisors, whose sum is σ = 55131092. Its totient is φ = 55131090.

The previous prime is 55131079. The next prime is 55131127. The reversal of 55131091 is 19013155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55131091 - 2⁷ = 55130963 is a prime.

It is not a weakly prime, because it can be changed into another prime (55131061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27565545 + 27565546.

It is an arithmetic number, because the mean of its divisors is an integer number (27565546).

Almost surely, 2^55131091 is an apocalyptic number.

55131091 is a deficient number, since it is larger than the sum of its proper divisors (1).

55131091 is an equidigital number, since it uses as much as digits as its factorization.

55131091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 675, while the sum is 25.

The square root of 55131091 is about 7425.0313804051. The cubic root of 55131091 is about 380.5971474609.

The spelling of 55131091 in words is "fifty-five million, one hundred thirty-one thousand, ninety-one".