1213309247 has 2 divisors, whose sum is σ = 1213309248. Its totient is φ = 1213309246.

The previous prime is 1213309241. The next prime is 1213309249. The reversal of 1213309247 is 7429033121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213309247 - 2²⁴ = 1196532031 is a prime.

Together with 1213309249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213309241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606654623 + 606654624.

It is an arithmetic number, because the mean of its divisors is an integer number (606654624).

Almost surely, 2^1213309247 is an apocalyptic number.

1213309247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213309247 is an equidigital number, since it uses as much as digits as its factorization.

1213309247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1213309247 is about 34832.5888644528. The cubic root of 1213309247 is about 1066.5727963075.

The spelling of 1213309247 in words is "one billion, two hundred thirteen million, three hundred nine thousand, two hundred forty-seven".