55015091 has 2 divisors, whose sum is σ = 55015092. Its totient is φ = 55015090.

The previous prime is 55015021. The next prime is 55015099. The reversal of 55015091 is 19051055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55015091 - 2¹⁰ = 55014067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55015091.

It is not a weakly prime, because it can be changed into another prime (55015099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27507545 + 27507546.

It is an arithmetic number, because the mean of its divisors is an integer number (27507546).

Almost surely, 2^55015091 is an apocalyptic number.

55015091 is a deficient number, since it is larger than the sum of its proper divisors (1).

55015091 is an equidigital number, since it uses as much as digits as its factorization.

55015091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 55015091 is about 7417.2158523263. The cubic root of 55015091 is about 380.3300249291.

The spelling of 55015091 in words is "fifty-five million, fifteen thousand, ninety-one".