1247230217 has 4 divisors (see below), whose sum is σ = 1267676676. Its totient is φ = 1226783760.

The previous prime is 1247230213. The next prime is 1247230241. The reversal of 1247230217 is 7120327421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7120327421 = 727 ⋅9794123.

It can be written as a sum of positive squares in 2 ways, for example, as 267289801 + 979940416 = 16349^2 + 31304^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247230217 - 2² = 1247230213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1247230217.

It is not an unprimeable number, because it can be changed into a prime (1247230213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10223138 + ... + 10223259.

It is an arithmetic number, because the mean of its divisors is an integer number (316919169).

Almost surely, 2^1247230217 is an apocalyptic number.

It is an amenable number.

1247230217 is a deficient number, since it is larger than the sum of its proper divisors (20446459).

1247230217 is an equidigital number, since it uses as much as digits as its factorization.

1247230217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20446458.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 1247230217 is about 35316.1466895810. The cubic root of 1247230217 is about 1076.4211144126.

Adding to 1247230217 its reverse (7120327421), we get a palindrome (8367557638).

The spelling of 1247230217 in words is "one billion, two hundred forty-seven million, two hundred thirty thousand, two hundred seventeen".