1721612227 has 2 divisors, whose sum is σ = 1721612228. Its totient is φ = 1721612226.

The previous prime is 1721612213. The next prime is 1721612267. The reversal of 1721612227 is 7222161271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721612227 - 2¹⁵ = 1721579459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1721612267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860806113 + 860806114.

It is an arithmetic number, because the mean of its divisors is an integer number (860806114).

Almost surely, 2^1721612227 is an apocalyptic number.

1721612227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721612227 is an equidigital number, since it uses as much as digits as its factorization.

1721612227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 1721612227 is about 41492.3152764461. The cubic root of 1721612227 is about 1198.5195230838.

Adding to 1721612227 its reverse (7222161271), we get a palindrome (8943773498).

The spelling of 1721612227 in words is "one billion, seven hundred twenty-one million, six hundred twelve thousand, two hundred twenty-seven".