55309091 has 2 divisors, whose sum is σ = 55309092. Its totient is φ = 55309090.

The previous prime is 55309069. The next prime is 55309097. The reversal of 55309091 is 19090355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55309091 - 2⁶ = 55309027 is a prime.

It is not a weakly prime, because it can be changed into another prime (55309097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27654545 + 27654546.

It is an arithmetic number, because the mean of its divisors is an integer number (27654546).

Almost surely, 2^55309091 is an apocalyptic number.

55309091 is a deficient number, since it is larger than the sum of its proper divisors (1).

55309091 is an equidigital number, since it uses as much as digits as its factorization.

55309091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 55309091 is about 7437.0082022276. The cubic root of 55309091 is about 381.0063147228.

The spelling of 55309091 in words is "fifty-five million, three hundred nine thousand, ninety-one".