55111601 has 2 divisors, whose sum is σ = 55111602. Its totient is φ = 55111600.

The previous prime is 55111597. The next prime is 55111613. The reversal of 55111601 is 10611155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 19351201 = 5980^2 + 4399^2 .

It is a cyclic number.

It is not a de Polignac number, because 55111601 - 2² = 55111597 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55111631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27555800 + 27555801.

It is an arithmetic number, because the mean of its divisors is an integer number (27555801).

Almost surely, 2^55111601 is an apocalyptic number.

It is an amenable number.

55111601 is a deficient number, since it is larger than the sum of its proper divisors (1).

55111601 is an equidigital number, since it uses as much as digits as its factorization.

55111601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 55111601 is about 7423.7188120241. The cubic root of 55111601 is about 380.5522924764.

Adding to 55111601 its reverse (10611155), we get a palindrome (65722756).

The spelling of 55111601 in words is "fifty-five million, one hundred eleven thousand, six hundred one".