55115791 has 2 divisors, whose sum is σ = 55115792. Its totient is φ = 55115790.

The previous prime is 55115783. The next prime is 55115821. The reversal of 55115791 is 19751155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55115791 - 2³ = 55115783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55115701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27557895 + 27557896.

It is an arithmetic number, because the mean of its divisors is an integer number (27557896).

Almost surely, 2^55115791 is an apocalyptic number.

55115791 is a deficient number, since it is larger than the sum of its proper divisors (1).

55115791 is an equidigital number, since it uses as much as digits as its factorization.

55115791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 34.

The square root of 55115791 is about 7424.0010102370. The cubic root of 55115791 is about 380.5619363848.

The spelling of 55115791 in words is "fifty-five million, one hundred fifteen thousand, seven hundred ninety-one".