2211551 has 2 divisors, whose sum is σ = 2211552. Its totient is φ = 2211550.

The previous prime is 2211541. The next prime is 2211557. The reversal of 2211551 is 1551122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105775 + 1105776.

It is an arithmetic number, because the mean of its divisors is an integer number (1105776).

2^2211551 is an apocalyptic number.

2211551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211551 is an equidigital number, since it uses as much as digits as its factorization.

2211551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100, while the sum is 17.

The square root of 2211551 is about 1487.1284409895. The cubic root of 2211551 is about 130.2863706771.

Adding to 2211551 its reverse (1551122), we get a palindrome (3762673).

The spelling of 2211551 in words is "two million, two hundred eleven thousand, five hundred fifty-one".