55111001 has 16 divisors (see below), whose sum is σ = 63533760. Its totient is φ = 47278080.

The previous prime is 55110989. The next prime is 55111003. The reversal of 55111001 is 10011155.

It is a de Polignac number, because none of the positive numbers 2^k-55111001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55111003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95225 + ... + 95801.

It is an arithmetic number, because the mean of its divisors is an integer number (3970860).

Almost surely, 2^55111001 is an apocalyptic number.

It is an amenable number.

55111001 is a deficient number, since it is larger than the sum of its proper divisors (8422759).

55111001 is a wasteful number, since it uses less digits than its factorization.

55111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064.

The product of its (nonzero) digits is 25, while the sum is 14.

The square root of 55111001 is about 7423.6784009007. The cubic root of 55111001 is about 380.5509114471.

Adding to 55111001 its reverse (10011155), we get a palindrome (65122156).

The spelling of 55111001 in words is "fifty-five million, one hundred eleven thousand, one".