1217240249 has 2 divisors, whose sum is σ = 1217240250. Its totient is φ = 1217240248.

The previous prime is 1217240197. The next prime is 1217240251. The reversal of 1217240249 is 9420427121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815959225 + 401281024 = 28565^2 + 20032^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217240249 - 2⁸ = 1217239993 is a prime.

Together with 1217240251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1217243249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608620124 + 608620125.

It is an arithmetic number, because the mean of its divisors is an integer number (608620125).

Almost surely, 2^1217240249 is an apocalyptic number.

It is an amenable number.

1217240249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217240249 is an equidigital number, since it uses as much as digits as its factorization.

1217240249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1217240249 is about 34888.9703058144. The cubic root of 1217240249 is about 1067.7234180364.

The spelling of 1217240249 in words is "one billion, two hundred seventeen million, two hundred forty thousand, two hundred forty-nine".