1131213217 has 2 divisors, whose sum is σ = 1131213218. Its totient is φ = 1131213216.

The previous prime is 1131213199. The next prime is 1131213253. The reversal of 1131213217 is 7123121311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1047234321 + 83978896 = 32361^2 + 9164^2 .

It is an emirp because it is prime and its reverse (7123121311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131213217 - 2²³ = 1122824609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131213287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565606608 + 565606609.

It is an arithmetic number, because the mean of its divisors is an integer number (565606609).

Almost surely, 2^1131213217 is an apocalyptic number.

It is an amenable number.

1131213217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131213217 is an equidigital number, since it uses as much as digits as its factorization.

1131213217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 22.

The square root of 1131213217 is about 33633.5133014676. The cubic root of 1131213217 is about 1041.9530659561.

Adding to 1131213217 its reverse (7123121311), we get a palindrome (8254334528).

The spelling of 1131213217 in words is "one billion, one hundred thirty-one million, two hundred thirteen thousand, two hundred seventeen".