55071791 has 2 divisors, whose sum is σ = 55071792. Its totient is φ = 55071790.

The previous prime is 55071781. The next prime is 55071817. The reversal of 55071791 is 19717055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55071791 - 2⁶ = 55071727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55071701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27535895 + 27535896.

It is an arithmetic number, because the mean of its divisors is an integer number (27535896).

Almost surely, 2^55071791 is an apocalyptic number.

55071791 is a deficient number, since it is larger than the sum of its proper divisors (1).

55071791 is an equidigital number, since it uses as much as digits as its factorization.

55071791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11025, while the sum is 35.

The square root of 55071791 is about 7421.0370569079. The cubic root of 55071791 is about 380.4606394440.

The spelling of 55071791 in words is "fifty-five million, seventy-one thousand, seven hundred ninety-one".