1813242217 has 2 divisors, whose sum is σ = 1813242218. Its totient is φ = 1813242216.

The previous prime is 1813242161. The next prime is 1813242247. The reversal of 1813242217 is 7122423181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 957036096 + 856206121 = 30936^2 + 29261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1813242217 is a prime.

It is a super-2 number, since 2×1813242217² = 6575694675022150178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1813242247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906621108 + 906621109.

It is an arithmetic number, because the mean of its divisors is an integer number (906621109).

Almost surely, 2^1813242217 is an apocalyptic number.

It is an amenable number.

1813242217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813242217 is an equidigital number, since it uses as much as digits as its factorization.

1813242217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 1813242217 is about 42582.1819192018. The cubic root of 1813242217 is about 1219.4161447534.

Adding to 1813242217 its reverse (7122423181), we get a palindrome (8935665398).

The spelling of 1813242217 in words is "one billion, eight hundred thirteen million, two hundred forty-two thousand, two hundred seventeen".